The biggest barriers to personalization, and how to fix your customer data

The biggest barriers to personalization are data problems: marketers named limited and fragmented customer data as their top challenges, at 19% each, and 42% say more accurate data would most improve their performance, according to The Customer Marketing Gap, a 2026 report from Wunderkind and Cordial, an agentic messaging platform with an embedded CDP for enterprise retail brands. Better personalization starts with connected data and stronger identity.

What’s stopping marketers from delivering more personalized experiences?

Customer data, more than budget or buy-in. No single barrier dominates, but the top challenges are:

• Limited customer data (19%)
• Data spread across too many systems (19%)
• Privacy and compliance concerns (15%)
• Difficulty measuring ROI (12%)

Organizational issues rank far lower. According to The Customer Marketing Gap, just 5% cite limited internal resources and 3% cite a lack of executive buy-in. Marketers want to personalize. Many lack the connected data to do it well.

Why is fragmented customer data such a big problem?

Fragmented customer data breaks the link between what a brand knows and what it can do. When identity, browsing, purchase and engagement data sit in separate systems, each team sees only part of the customer, and acting on changing intent gets slow.

The teams closest to activation feel it most. According to The Customer Marketing Gap, fragmented data rises to 33% among lifecycle marketers, 30% among CRM teams and 27% among ecommerce teams. 30% of ecommerce marketers also cite limited customer data.

Lifecycle, CRM, and ecommerce teams are the ones sending triggered email and SMS, running cart recovery and managing retention, so disconnected data limits them most directly.

Which customer data matters most for personalization?

Behavioral data. According to The Customer Marketing Gap, marketers rank purchase history and browsing behavior as their most valuable personalization data sources, at 51% each.

The two signals do different jobs. Purchase history shows what a customer has valued before. Browsing behavior shows what they might want now.

Which signal leads depends on the role. According to The Customer Marketing Gap, 67% of SVPs favor purchase history, while 55% of CMOs favor browsing behavior. Ecommerce teams place especially strong emphasis on browsing as a sign of current intent.

What capabilities would most improve customer marketing performance?

Data and identity come first. Marketers ranked these capabilities as having the greatest potential impact:

• More accurate customer data (42%)
• Improved personalization (37%)
• Better identity resolution (27%)
• Better AI capabilities (27%)
• Cross-channel orchestration (19%)

The order is telling. Marketers see accurate data and identity as the foundation that makes personalization and AI work. AI can only act on the data it’s given.

How do you connect acquisition and retention on one customer view?

Treat acquisition and retention as one journey. According to The Customer Marketing Gap, acquisition is marketers’ top priority at 51%, followed by retention at 39%, efficiency at 30% and customer lifetime value at 22%. Those goals are often run by different teams on different systems.

The report recommends turning anonymous visitors into known customers, then carrying that understanding from first purchase through repeat engagement. That requires a persistent identity and a single place where data and decisions come together.

This is how the Wunderkind and Cordial integration works. Wunderkind recognizes more of the anonymous shoppers already on your site and surfaces their intent signals. Cordial, an agentic messaging platform with an embedded CDP, brings that data together with purchase and engagement history, predicts what each customer is likely to do next and decides what to send, when and on which channel. Because the data lives in the same system as the messaging, insight turns into action faster.

How to apply this

• Map where customer data lives today and which teams can access it.
• Prioritize connecting browsing, purchase and engagement data around one customer identity.
• Invest in identity resolution to recognize more visitors before they log in.
• Build privacy, consent and measurement into the data foundation from the start.
• Fix data accuracy before layering on more AI or personalization.

Frequently asked questions

What is a CDP?

A customer data platform (CDP) brings customer data from different sources into one unified profile per person, so marketing teams can segment and personalize from a single view.

What is a single customer view?

A single customer view is one complete profile per customer that combines identity, behavior, purchases and engagement across channels and systems.

What is identity resolution?

Identity resolution matches data from different devices, sessions and channels to the same person, so brands can recognize shoppers who haven’t logged in.

What is the biggest barrier to personalization?

In the Wunderkind and Cordial research, marketers named limited customer data and data spread across too many systems as the top barriers, at 19% each.

Get the full report

The Customer Marketing Gap includes marketer priorities, data challenges and capabilities by role and function, alongside the consumer view. Download the report.