My mowers are at the highest settings. Easier on the grass and mowers that way. The only downside is more frequent mowing.
I've cut my lawn(s) at least 3" high for years and use a mulching blade.
I find this creates a beautify lawn after a couple of years.
Seasonal precipitation trends are important. The wetter the shorter (2") you can mow without stressing the grass. As the season warms and drys the grass can grow a bit longer (3").
Just a bit of practice that has worked for me.
Cheers