I believe having more proprietary software available on all platforms (including Mac) improves the situation - especially something "basic" like a mail client.

I believe having more proprietary software available on all platforms (including Mac) improves the situation - especially something "basic" like a mail client. Yes, FOSS and Linux are "a more natural" match than proprietary and Linux, but the truth is: You can't get everything you might want/need for free at an acceptable quality . Working for a company which sells niche-software for both Windows (most customers) and Linux (some big $$$ customers), I am happy to see more mainstream developers doing the same. If you're a making consumer software: Please try to follow suit! Internally, we develop on and for Linux, but our code is cross platform enough (thanks Qt) to easily build on Linux and Windows. The biggest issue for me is remembering which C++ constructs work with GCC/clang but not with the MS compiler (which improved a lot in the last years - and which our CI usually notifies me about).