Because some people legitimately depend on this to medicate themselves and need reliable, stable supply of the strains that work for them. Not everyone on here is a smartass cheating the medical system to get legal weed. Because it has been legalized federally doesn't mean people suddenly don't need weed medically anymore.
Would you tell me I shouldn't look at the medical side of Adderall and not be pissed at my pharmacy for running out of stock if amphetamines got legalized because "it was only a temporary measure to get them to legalization"? Fuck no.
My ADHD won't suddenly disappear because any of the substances I need on a daily basis got legalized.