Kaiser was an HMO early when Americans weren’t used to HMOs. Americans were spoiled with go anywhere, never see a bill health insurance provided by their employers. That’s the root of the complaints.
Since then, Kaiser has on occasional given itself a black eye with organ problems etc.
But otherwise, it basically boils down to rationing and much like the recent protest in LA by the Armenian community, boils done to someone isn’t going to get the additional treatment they want to try because it just doesn’t make cost effective sense.