They are not sloppy brawlers
They are not sloppy brawlers w/no real boxing experience. Their striking style is modified to defend takedowns & leg strikes.
These things are not as mutually exclusive as your wording suggests, man. Many of them are sloppy brawlers but even the technical guys haven’t fully adapted to the ranges of modern pugilism. It’s still a primitive sport but your jab breakdown was spot-on man.