The ear is not going to adhere to the stud in any meaningful sense. Yes, oozing lymph is going to glue things in place until you soak it off, but that’s not flesh growing onto the metal itself. Turning the stud tears up the dried crusty and potentially rips up the new cells.
Imagine I’ve skinned my knee. Would you suggest I scrape off the scab every day as a way to promote quick healing free of scars and infection? That’s essentially all that turning the post does. (Heck, turning the jewelry when plasma has things gummed together can cause the unpierced skin near the piercing to tear as the crust’s will to stick is stronger than it-- I’ve witnessed this in action with a girl who thought she should rotate the barbells in her nipples. Oh the blood.)
Turning the stud is a holdover from when materials much more porous than what modern jewelry was made of was used. If you happen to have to wear pieces of bamboo in your newly pierced ears, than you would want to regularly turn them, but it’s unnecessary and traumatizing otherwise.
As for why guns are bad, even on earlobes: the primary issue is that the piercing stud used in a gun is invariably dull and pushed through the tissue with force. Imagine a railroad spike compared to a razor sharp chisel.
Guns have other flaws, depending on design, but another issue that could apply in the OP’s case is that many force the studback on ridiculously tight, which obviously isn’t good for healing tissue.
Yes, many people get their ears gunned, rotate the studs, pour on harsh chemicals and ultimately heal lobe piercings without issue. But I’ve also seen some really gruesome keloid scarring, holes that don’t ever seem to heal, and a tremendous amount of unpleasant irritation (not to mention poorly placed or angled piercings) that could easily be avoided by getting needle pierced instead of gunned. But I like to minimize risk as much as possible when opening my flesh, even in tiny ways. (Yes, I put bandaids and Neosporin on papercuts.)
Speaking of Neo, if I remember correctly, it does say on the packaging not to use it on puncture wounds. An ear piercing is different from stepping on a nail, in that both ends of the puncture are open, but I’m still iffy about introducing something thick and oily into a hole.
Why yes, I can talk about this stuff for days.