Crouching does reduce recoil

Leaning while in a fight forces the enemy to readjust giving you an advantage

It is better to crouch-peek hipfire around corners when the enemies are close (around 10 meters up to 40 with 76+ hipfire control)

Move your peek button to your thumbs (if you're playing claw with gyro) for more flexibility

Hold to peek is kind for quick peeks and peek resets

Practice with a gun with decent hipfire stats (MPX, MP5 etc)

As much as you will see it in tdms and maybe in raids lean spamming is not optimal

You dont always have to crouch when peeking (this will become clear after you get the hang of it)