Percentages can hide the impact of tendencies. Steam has 132MM monthly active users, assuming the poll is a representative sample. Then, 2% is a bit over 2.6MM people using a linux device. This doesn't include steamOS. That's at least equivalent to an entire small country's population using Linux.
Hey, where u get those numbers from?? I thought they stopped disclosing these a few yrs back. Personally I would've guessed its closer to 150m myself but I'd like to see any reports or more informed speculation if possible.
It used to be common and useful. I did this even after Valve shipped a native Linux TF2 as at the beginning the Wine method gave better results on my hardware. But that time has long passed as Valve has integrated Wine (Proton) and in almost all cases the Linux native builds will outperform Wine (and Steam will let you use the Windows version via Proton if you want even if there is a native Linux build).
So while I suspect that there are still a few people doing this out of momentum, habit or reading old tutorials I am not aware of any good reasons to do this anymore.