There's an argument to not have an all-in-one provider though: it increases vendor lock-in. If a company turns into a direction you don't like, you'd have to find a suitable alternative to replace all of your services, and that takes a lot of time and effort. If you spread it between multiple companies however, you'll only need to switch a few, maybe even have less work if you use a domain (for example for custom aliases).
Plus, something about Proton I disliked is that their products are missing key features you just expect from your products. For example, every mail provider offers you the option to add todo-lists or even journals, because WebDAV just has it, however Proton still lacks that to my knowledge. Other password safe programs have a folder system to better organise your entries. Proton Pass does not. I'd rather use many companies that each does one thing well than one that does everything rather mediocre.