The necessity for rebalancing tires may be more specific to individual tire types.
I've noticed the BFG KO series requires more weights and is more effort to balance than a Michelin road tire.
The local mechanic's shop is pretty small and the lead mechanic owns the shop.
Whenever I have any work done, I spend all of my time in the garage and have a front-row seat to all work completed on my vehicle.
That said, many years ago during a seasonal wheel change I was too lazy to complete, I got curious about the state of balance on my several-year-old winter BFGs.
The shop agreed to spin the wheels first to check the balance before popping the weights off.
I was standing next to the mechanic at the balancing machine and saw firsthand when 2 of the 4 wheels failed.
The burlier AT-type tires may be worth a recheck every once in a while.
YMMV
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