No. Password managers are applicable beyond browser & android environments. Beyond that, other products provide features & UX that may be preferred, and some companies require a specific password manager (and forbid the use of Google's offerings).
Password managers existed in browser's and on apple products for a long while now. The problem is that they tie you to an ecosystem and if you're not allllllll bought in, you can't use it oast your phone for example.
Chrome and Firefox extension aren’t as seamlesss but pretty smooth. This means can use 1Password where could never use Google or Apple.