I'm currently using a 4K 27" as my main desktop monitor and find it fine, windows scaling is actually good these day and you don't notice it
Can definitely see preferring a bigger screen though
windows scaling is terrible, not all applications actually scale that is the biggest issue
some apps looks great and some look terrible.
then when you run multiple monitors & want to run a game at non native resolution sometimes scaling breaks the game location & puts it off the screen...
Windows scaling has so many issues but for the most part it works "ok" but its not good.
Apple Window scaling is far superior & done right every app is uniform even 3rd parties everything is scaled correctly across 4 different resolutions across 4 different screens & one scaling does not break the scaling on other monitors.
Which Windows would follow suit in this regard, set good solid standards for Scaling support