"No security features should exist for anyone" is itself fanatically hyperbolic narrative. The primary reason this event has elicited such a reaction is because OnePlus has historically been perceived as one of the brands specifically catering to people that wanted ultimate sovereignty over their devices.

As time goes on, the options available for those that require such sovereignty seem to be thinning to such an extent that [at least absent significant disposable wealth] the remaining options will appear to necessitate adopting lifestyle changes comparable to high-cost religious practices and social withdrawal, and likely without the legal protections afforded those protected classes. Given the "big tech's" general hostility to user agency and contempt for values that don't consent to being subservient to its influence peddling, intense emotional reaction to loss of already diminished traditional allies seem like something that would reasonably viewed compassionately, rather than with hostility.