you're correct. UHC is so hated because they're a "pharmacy benefits manager." - an organization that exists soley to make your life so miserable you give up on getting your medication.
Aetna has their own scumminess. Want the convenience of 90 day refills? Have to use their mail order service. They'll refuse to authorize >30 day supplies of medication through any other pharmacy.
Oh yes, because the vast majority of employers in the US say "pick whatever healthcare plan you want from whatever carrier you want, we'll make it work" and not "You'll get what you're given and be glad for it".
Even in tech spaces with money to throw around, that just means that maybe your partner and dependent's premiums will be covered/negligible, or that your deductible will be low.
You're still going to be fucked by their policies, though.