As a 20 years Gmail user, in case anyone was interested ..
I did a long evaluation of Proton Mail vs FastMail vs Infomaniak Mail trying to see which one is best.
FastMail won out, as it was the most compatible with my Gmail programed brain. It's features lined up most closely with Gmail.
Outside of UI issues .. Proton Mail slow page loads also drove me nuts, and Infomaniak was just straight up missing features.
commit 9ae4235