What are peoples thoughts on shadowboxing with gloves on... pros? cons?

I was just thinking, instead of using hand weights to use maybe 18 oz gloves. I know 18 oz's is just above a pound and most ppl that chose to shadow box with weights probably use 2-3 lbs.

But I was thinking that there might be a few benefits of shadowboxing with heavier gloves rather than weights, if you chose to shadow box with anything at all.

It'll still help condition your arms, and at the same time you can stay relaxed and really work throwing your shots out and clenching your fist before contact... where as with weights, your're really going to be getting into the habit of clenching your fist while moving around.

Over time, depending on how often you shadowbox with weights you might come to point where it becomes so ingrained into your muscle memory that you keep a tight fist even while having gloves on.. leading to more telegraphed punches and unnecessary energy being wasted doing it.

I dont know, maybe I'm completely wrong, but I just figured, you u really wanna put weight on your arms while shadow boxing, why not do it in the form of gloves, and keep it as close to the real thing as possible.