Is it that necessary for another mail client? I find that Thunderbird works just fine myself. I'm not sure if I need something that's "beautiful".. All I need i

Is it that necessary for another mail client? I find that Thunderbird works just fine myself. I'm not sure if I need something that's "beautiful".. All I need is when it gets the job done and thunderbird does that quite well. Any use cases that I'm missing perhaps?