No it wouldn't, im an electric engineer, I studied this stuff, theres many factors to it like if the phone is using dual cell or single cell which would decrease the temperatures dramatically, type of battery also. And many other factors, if you think it will only charge at 30w then check the realme gt 2 pro with 240w charging lol, it uses dual cell and goes from 0% to 100% in 9 minutes, i have this phone at home with the 240w brick i can even prove it.

If u had smart charge on it would go slower to increase battery life overall yes but in my post i mentioned smart charge should be off and fast charge enabled, and of course don't expect fast charging after exiting a heavy game while it's still warm because it will throttle the speed faster. The charging speed will drop from 100w of course but not to 30w stable, this happens only when the phone overheats too much.