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Maybe they could work on Thunderbird again; that's a product actually used that doesn't have many real competitors.

They have way more competitors in that space, but I still use it because it's clean and bloat free.

Really? What are all these desktop e-mail clients other than Thunderbird, Outlook, and Mail.app? And how many of them are cross-platform?

I remember looking into whether there were alternatives for a while and really not being able to find anything.

Nylas, Polymail.. just to name a few

So a tool specialized for sales professionals (apparently) and a Mac-only product. Well, you can see what I mean.