You could only get those metrics from Chromium. Are they really Google Web Vitals if you only can get them from one of the browser engines? I think if we’re introducing something that’s supposed to be vital for all users, it should exist in all browsers.
Almost all performance tools implemented the metrics (for Chrome) immediately. Google said jump, and web performance tool vendors said: ‘How high?’. A little more caution would have been good. I also felt the pressure of adding those metrics to the tools I build. Google’s monopoly on web performance metrics is not good for the web, I think.