No I get that but I now have to look at it three times. Say I am using some feature, f, then I have to go check the case where the browser supports @supports but not @supports(f), supports @supports(f) and does not support @supports, since the styling changes are not all in isolation.

Now to make it even crazier say we have another feature f1 that somehow impacts the case of @supports(f). We'll need to check five different cases (@s(f) + @s(f1), !@s(f) + @s(f1), etc...). It seems like I might as well just find the minimum feature set I can use and just go ahead with that. Anything more and there would be too much mental work for me.