Earlier quoted context omitted.
Open source video game console emulators are certainly not worse. If anything, the best by far emulator (Dolphin) is open source, but even beyond that almost every open source VGC emulator is also open source and those emulators tend to be the most long running ones (almost always because the developers of the closed source emulators lose interest). For some systems, you have only open source emulators.
There are several systems where your only option is Windows, unless the situation has changed drastically since I last looked into it. I remember Dreamcast, Saturn, DS, PSP, and PS2 being in this category, and also the options for N64/PSX not being very good, the last time I was interested. Of course, someone can respond to arguments about any program being missing with "well, I don't care about those," but you can't…
Saturn: https://yabause.org/
PSP: http://www.ppsspp.org/index.html
PS2: https://pcsx2.net/
All of these are open source, support Linux, and have good compatability.