I only use Proton for the spam or temporary low value (and free) email accounts. Proton also tries to do everything, which I don't like. If I did I'd use Google.
The thing I pay for is Tuta. The cheapest tier is way more generous than Proton and the product is simpler.
I have the exact opposite opinion. I use proton business together with their email, vpn, calendar, drive (on macOS), password manager etc. and switched specifically because of their encryption, data protection and fulls-size feature bundle. Plus, I migrated vom Office365 and it became a shitshow to manage and was full of bugs. And I had a separate bitwarden subscription, and a separate VPN subscription. Now it is one package, much preferred.
I have also been using Tuta for years. No complaints