All pilots are limited to 200hp or less, and non-complex aircraft without separate instruction and endorsement. 14 CFR 61.31(e) & (f)
https://www.ecfr.gov/current/title-14/chapter-I/subchapter-D...
One of the more arbitrary and kinda pointless rules. Someone flying a 160 knot 200 hp Piper Arrow with a controllable prop and retractable gear doesn’t need the endorsement. Someone flying a 90 knot fixed gear fixed prop biplane with a 205 hp engine does.
It’s pretty much “use more right rudder”. Although most aircraft with over 200 hp have a constant speed prop so you learn to use manifold pressure and engine speed to set power.
I went from a 145 hp plane to a 235 hp one with about 30 min of instruction during a BFR.
You could always get endorsements as a sport pilot, but complex and high performance didn’t make sense because there were no LSAs that qualified. But tons of people got tailwheel endorsements as sport pilots in the past. Now a bunch of sport pilots are going to get complex and high performance endorsements too.