The steel bumper group from the factory is an upgrade over all the other JL bumper options. The front is fine for crawling and accepts a winch but you still need a winch plate. I picked up mine on sale at Artec for less than $200.
The rear is not the best for rock crawling as most after market bumpers are thicker gauge. Still, I only ever plan to replace mine if it gets busted up and so far it’s held up fine after some moderate hits.
I wouldn’t put a bumper mounted tire carrier on a JL. The magnesium tailgates and big aluminum hinge assemblies seem to hold up just fine up to 35s. I’ve heard of one, maybe two tailgate issues since the JL came out in 18.
I did buy the Rugged Ridge tailgate reinforcement which replaces the hinges. It’s got 35k miles and a decent amount of wheeling with a 37 on it and it’s been great.