> Which begs the question, why would you use Proton Mail if you’re gonna negate its unique value proposition?

Because most users don't care about the end to end encryption. They just want to host their email somewhere [1]. And perhaps have it available offline.

All this encryption on everything is mostly turning into security theatre. All mostly because identity theft is so easy in the US. Perhaps that's the problem that needs to be fixed.

[1] lately somewhere that is not Google.