I'm not sure some will use rearms all that much, actually, like Dolby brings up.
But it doesn't hurt to have them in that case. Also, bombers and attack aircraft and some fighters might welcome the ability for reasons I talk about below.
The reason I don't think some will use them is that the extra waiting for launch window and the extra time to get all the way back to a rearm will in a lot of cases be similar. Consider if launching, climbing to alt, flying out to a combat area takes 20 minutes, patrolling 10 more, and getting in some fights for maybe 10 more minutes -- that all ads up to 40 minutes. You can land quickly, wait a little, and relaunch with a fresh plane in 20 more minutes. Or, you can fly farther back to a rearm pad, rearm (maybe 15 minutes to get there and rearm) and maybe be farther away from the action than one of the relaunch bases (maybe another 5 minutes out in comparison). In that case, it's a wash.
However, there might be folks who go past the 1 hour mark -- longer bomber escorts, longer bomber missions, longer attack missions, what have you. For those folks, getting back to anything they can land at might not be T+40 to T+60. If it's, say, T+1 or T+20, they would likely want to rearm.
So, while I think not everyone will be using rearms, it doesn't hurt, and there might be some folks (depending on mission profile) who would welcome rearm ability.