I would say it varies per individual, but tartuwolf laid out most of the obvious reasons.What is the appeal of a heavy (4.5oz+) jacket? I’ve never owned one, but it seems like it would be quite uncomfortable and looks almost a bit lumpy to me. I’d appreciate other perspectives since they seem favored on TFL.
Personally I dislike what I like to call flimsy leathers, aka lightweight or less than 1mm thickness, mostly because I like a tight fit but I’m also pretty rough on my clothes and I prefer items that look better with wear vs ones I have to baby and be careful with to keep them looking nice.
Most of mine are mid-weight or in the 1mm-1.5mm thickness range and I usually immediately break-in the stiff ones to avoid the cardboard straight-jacket feeling, but I do have one heavyweight jacket around 2mm thickness and in the 8-10 lbs ballpark that I purposely bought in a leather that isn’t stiff and needed relatively no break-in to particularly avoid the issues you mention (uncomfortable and lumpy).
It is my first heavyweight and I can only say good things about it, it’s a tight fit but not restrictive, the leather feels and smells amazing and there really is something about wearing a heavy top layer that feels very comfortable and secure both on and off the bike.
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