You also need to be on the paying tier for a usable product. I evaluated a number of options when I was trying to decide where to park my domain long term. Cue an incident at a border crossing where immigration wanted to see a hotel booking that search insisted didn't exist. Turns out the booking email was a few days outside the free tier search window, and that limitation wasn't obvious in the pressure of an immigration queue. Felt like I had been gaslit once I realized.
This makes backing up emails trivial.
Tutanota still doesn't have an easy way to export all emails.
I only upgraded to a paid tier about a year ago, before that I was using for about one and a half years for free with 0 issues.
Notifications never arrive late (at least on the IOS app)
Maybe it's because I'm not a heavy E-mail "Power user", but I see most of these as non-issues (this depends on your use case, of course)
Another huge pro for me, as a resident of Germany, the data stays in Germany and is protected under our strong data security laws.
I do have to agree, the search was kind of sucky for a while. But imo it's improved a lot is also pretty useable now.