I was in the “i want a smaller bike so it’s more chuckable camp”, so ran a small frame and short stem, then got a MTB that actually fitted me with a short stem. My body was in a better position to work the bike so it ended up being more planted and more chuckable.
Seems silly now that running it small was the thing to do, i already went through the same experiences on a BMX, one that fitted well served me much better than one that was too big or small.
But yea, of course if you went to big you’d lose chuckability, but if you went too small your body would be in the wrong position making it uncontrollable or less chuckable, it’s that balancing act.
it’s expensive but to find out what’s too big, you have to go too big, just as you have to go too small to find out what is too small.
Im a hair over 5ft 10 running a large 29er, the bike is always all sorts of sideways, in the air, can turn on a sixepence if i really wanted.