Integrating wallets into apps is bad UX, as you'd have to enforce everyone using the same wallet. Otherwise, users would end up having n number of wallets or have to take the extra step of forwarding all payments.

Integrating wallets would make also developers lazy about NWC and kill the independent wallet market.

This is the equivalent of trying to force everyone to use the same credit card.

Please note that the person suggesting that every app use Strike or Cashu.me is invested in both.