Because they're not emergency care facilities and have to fill hundreds of prescriptions per day as well as deal with insurance issues, idiotic doctors, moronic customers, give vaccines, and run Covid tests. If you want a drug refilled then why not use some common sense and call in advance to have it filled? If you've got a new script to drop off then yeah you're gonna be waiting because clearly you're not in imminent need otherwise you'd still be at the hospital. Put on your big boy pants and suck it up, nobody gives a shit.