I prioritize ease of use, reliability, basic features not behind a pay wall, solid support and ease of use through Thunderbird so I don't have to visit the awful web version of said mail program. While I had mentioned that I was on Tutamail, I did a search of them and found a Reddit post about them weighing pros and cons. The cons I read of them go against a little of the things I'm after.
So reluctantly, I had to go back to GMail. I spent over 20 minutes migrating, resetting, re-routing many addresses to my newer GMail. I know that privacy is neither here or there on surface web stuff so I don't care about privacy regarding that. I'll start caring about privacy when I sign up for more personalized things and that's where Tutamail is going to come into play.