I've tried lots of email clients but I always end back at Thunderbird. I'm curious, what makes it feel cumbersome to you? To me, Thunderbird + Nostalgy + Enigm

I've tried lots of email clients but I always end back at Thunderbird. I'm curious, what makes it feel cumbersome to you? To me, Thunderbird + Nostalgy + Enigmail + Colored Diffs = bliss.