I'd say they aren't as common because old ratchets mechanisms didn't have the strength and there wasn't as much need for the added reach. For automotive, generally the newer the car, the less room you have to work. I'm sure that's also the cause with other equipment/machinery
I don't have any XL ratchets but have run into times when an XL 3/8 drive (15-18") or XL 1/4 drive (10ish") would have been nice for the added reach or when more leverage is needed but a breaker bar or larger drive size ratchet won't fit in a tight spot. But if I had any XL ratchets, they would probably get used less than my standard length ratchets. For me, the "long" ratchets are the sweet spot, for most jobs
I haven't yet seen the need for an XL 1/2 ratchet in my line of work (light duty auto tech). In my experience when working on larger nuts/bolts, there has always been enough room for a breaker bar or impact wrench when my 18" 1/2 drive ratchet isn't enough. The auto techs I see, that have 24" ratchets, mostly just use them as an expensive breaker bar. 24" is alot to swing over and over and over