e2ee makes it easier to sell their hosted version, and there's probably not enough incentive to justify the additional overhead of having an unencrypted option.
Also, my house is less secure than commercial data centers, so e2ee gives me greater peace of mind about data safety.
> Also, my house is less secure than commercial data centers, so e2ee gives me greater peace of mind about data safety.
I think you overestimate security of data centers.
At rest, you use full-disk encryption anyway, so the extra layer just makes things harder.