Your users spend most of their time on other products. This simple observation, articulated by usability pioneer Jakob Nielsen, has profound implications for how much freedom designers actually have to innovate in interaction patterns. Users arrive at your product carrying a mental model built from every digital interface they have used before. When your product confirms that model, interactions feel effortless. When it contradicts it, users must unlearn existing patterns and build new ones — which is slower, error-prone, and frustrating, regardless of whether your pattern is objectively better.
The Psychology
The psychology is rooted in schema theory and procedural memory. Repeated interactions with digital interfaces encode as procedural knowledge — the kind that operates automatically without conscious attention, the way typing or driving eventually does. When a user reaches for a hamburger menu in the top-left corner or looks for the account settings in the top-right dropdown, they are executing a learned procedure, not consciously reasoning about the interface. Disrupting these procedures with novel interaction patterns forces the user back to conscious, effortful processing. The cognitive cost is real and measurable in task time and error rates.
In Product Design
This is not an argument for design stagnation. It is an argument for spending your innovation budget intentionally. Novel interaction patterns are worth the cost when they deliver substantial user value that conventional patterns cannot. But most products do not need novel navigation, novel form patterns, or novel feedback mechanisms. What they need is for those baseline interactions to work reliably so users can spend their cognitive resources on the actual task. The places to innovate are the product's core value proposition — the unique features that differentiate it. The places to conform are the structural scaffolding: login flows, navigation conventions, form behaviours, error patterns.
How to Apply It
Specific conventions worth preserving: the logo links home, the shopping cart is top-right, form submissions have a clearly labelled submit button, error messages appear near the field that caused them, links are underlined or consistently coloured, password fields have a show/hide toggle. These are not aesthetic choices — they are learned behaviours that a significant proportion of your users will execute automatically. Deviating from them without strong reason forces a proportion of users to figure out a new pattern and another proportion to make errors because their automatic behaviour was wrong.
Why It Matters
The creative tension here is real. Good design requires both conformity to shared conventions and differentiation from competitors. The resolution is: innovate in the domain, conform in the scaffolding. Build a uniquely powerful product, present it through familiar patterns. Users will readily attribute the positive experience to the product's capabilities, not to the novelty of its navigation. The products that age most gracefully are typically the ones that were ahead of their time in domain innovation and deeply conventional in everything else.
