[SahAssar]

Regardless of that it's not uncommon to have the same browser version support different media codecs/formats.

Regarding the examples, when it comes to Ogg Vorbis there is no issue with software decoding (it's software everywhere), AV1 was granted software decode support on some OS'es but not others in the exact same browser, version and hardware (and IIRC it's the encoding perf that is especially bad for AV1, not decoding) and the chrome on android issue also shows how legal or hardware issues are not the only things limiting what is available (it can also be bugs that just stay around).

All I'm saying is that testing for browser version A is not a surefire test. Either check the support or test on browser A version B on OS C version D on hardware E (for each of the A/B/C/D/E variants) or just stick with what works across the board. Either way you probably won't end up shipping a site with only webp support.