Highly depends on your threat model and what you are using email for. Using email for actual communication, besides creating accounts or reaching out for a random customer support, is a big mistake in my opinion. 
For me it's only about escaping data scraping (regarding email). I can rely on Proton regarding security without having to worry about any new backdoors or whatever that I would have to maintain/fix. They don't sell my data to bigtech companies even if the gov might get access in special cases (at least I think so). So why shouldn't I use Proton?