Security conscious and privacy conscious aren't the same thing, although there's overlap. I can be concerned about the security of my system without caring about whether I'm being targeted for ads.

Some particular build of Chromium and Chrome are vastly different systems. A lot of this is philosophical; The Mozilla way is to support standards and tut-tut at websites for doing overtly malicious things like looking at user-agent or asking for widevine, the Chromium way is to treat the web as a hostile actor and offensively subvert anti-user behaviors.

Any modern browser that doesn't actively fingerprint as either most-common Chrome on a laptop, most-common Android browser, or most-common iPhone is written by such hopelessly naïve nerds that they shouldn't be trusted with user-facing software with real security considerations.