I have the same Wranglers on my 00 Sport and I have 40k on mine and they
look like they will last another 40k or 50k.   Mine are dry rotting and
making tons of road noise already.  I will likely replace these next summer
because of the nervous factor.
About your concern,  I think those tires are just right for that vehicle
size.   You've been looking at too many vehicles with 20's.  ha ha Just
kidding.

I got my Wranglers in the Firestone incident.  I had requested Michelins
before the dealership put these on.  I will likely try the Michelins this
next time around.   Four years is quite short for tire life in my opinion.
especially when they still look brand new.

Scott