Sure, but they also don’t really have a business interest in keeping your passwords safe. If they have a breach, you either move your passwords or you don’t, they don’t see a financial hit. If Bitwarden or Proton have a breach, they lose paying customers to their competitors. They have to be better than their competitors to get your business, Google just bundles it with the rest of their stuff.

Also, Google is a massive target. They control the most popular browser, so there’s a ton of value in exploits. Bitwarden and Proton are competitively smaller, so the attacks are likely to be less sophisticated vs attacks against Chrome. The surface area of attack for a separate password manager is also quite small, so it’s comparatively easier to secure.

So yeah, that’s why I use something outside my browser. I use Bitwarden for my password manager (I intend to self-host it soon), and it works well.