The biggest UX mistake in onchain products is making the chain visible. Users do not want to think about gas, signatures, or chain selection — they want the product to work.
The pattern that wins is to design the experience like a normal modern app and treat the chain as infrastructure. Wallet connections happen at the moments where they add value, not on the home page.
Smart defaults matter. Pre-select the right network. Hide signing where you can. Translate fees into clear language users understand. Use familiar patterns for forms, navigation, and feedback.
Underneath, the engineering still has to be solid: gas-optimised contracts, predictable transaction states, and clear error handling. The discipline is to keep that complexity invisible to the user without taking away their control.