It depends on the wheels. These are well protected by the ring of my beadlock wheels. The values are 1.6” long from mounting surface. Wheels that have the valve mounting close to the rim edge, I agree with you, and would only run rubber valves.

I can’t think of a reason why to get XL stems unless your wheel is really thick. They do a pretty good job explaining on their website why you might want them. Having them stick out further than necessary could make it easier for them to catch on something and break.