I've heard people claim that if you never bulk, and never cut, but always eat at exactly maintenance (or close to it), that your body composition will never really change. The apparent reasoning would be that the body would have no need to expend fat for energy, yet cannot build new muscle due to no available energy surplus.
I don't know the science that well, but this does seem flawed.
Take an average person with an average build who doesn't lift. Let's say they weigh 170lbs. Have them start training very hard and very seriously 4x a week, but adjust their diet so they never lose nor never gain weight.
If this person keeps doing this for a long period of time, isn't a recomp inevitable?
There's no way their body composition wouldn't change, is there?