I agree. Not just breath control, but it takes memory as well, gotta remember the whole verse (unless you recording with the paper/phone in front of you reading, which is ass and it actually makes it sound less organic, imo). When the punching-in is done stylistically, like the dude, I can't remember his name but it was basically his thing, that shh!t is okay. Hoodrich Pablo Juan? Idk, one of them type dudes...one of the dude's who Soulja Boy jacked his style lol
When you can clearly hear it and it's obvious because the sound/tone/pitch of his voice is different each time, that shhit is super duper sloppy sounding to me. A lot of fans don't even notice it like that tho apparently..I hear that shh!t all thru Nas and Hitboy's albums...and Nas TBE imo, but yeah..