Seems like Proton is chasing the mythical customer that wants to run their company on the Proton suite (mail, calendar, drive, docs), because for some reason being super private is very important to the company.

I don't think this segment exists. Most companies' top priority is a no hassle and reliable stack (Google or Microsoft) and not one that is trying to catch up from a feature standpoint.

They should just focus on their main customer segment: individual users.