If you decide to use them, I'll leave them there as long as it causes no bandwidth issues, but you might want to mirror long-term :-) (and run them through an optimizer)
For now, I'll look into adding error messages for people that cannot initialize WebGL 2.
[Error] Unhandled Promise Rejection: Error: Can't find variable: WebGL2RenderingContext Evaluating https://magcius.github.io/model-viewer/render Evaluating https://magcius.github.io/model-viewer/viewer Evaluating https://magcius.github.io/model-viewer/embeds/main Loading embeds/main (anonymous function) (system.js:4:231) promiseReactionJob
So, if you're not seeing the examples, and you are _not_ using Chrome or Firefox, then you should try opening the site on that.
P.S. I really do not want to start a discussion on features not being in some browsers or others.