Try it. https://www.betterbird.eu/. The Thunderbird team has been ignoring huge quantities of bugs and usability issues for decades. They kicked out a profoundly gifted developer several years ago, who has been leading Betterbird, a careful “soft fork” of Thunderbird, which maintains all helpful interoperability while fixing many, many bugs. Betterbird is lighter and faster, it does CardDav address books natively to Gmail and other providers, it has a far better HTML email composer, and much, more more!