Kaiser isn't necessarily the best example here. Your doctor likely did that because Kaiser will generally not cover things like that, just as they'll almost never prescribe sildenafil or tadalafil or semaglutide (but they will happily refer you for gastric bypass...).

There are good things about Kaiser, but definitely not-so-good things. I'm still pissed at them for my fiancée, fresh from the dentist after a few root canals with a script for pain medication was told (at their hospital pharmacy, no less, so it wasn't that they didn't have it available) that they would only fill pain medication via mail order. "Oh good, so I just need to wait 5-7 business days for relief from my root canals."