As another example, YouTube uses a feature called HTML imports to load scripts. HTML imports haven't been widely adopted, either by developers or browsers alike

As another example, YouTube uses a feature called HTML imports to load scripts. HTML imports haven't been widely adopted, either by developers or browsers alike, and ECMAScript modules are expected to serve the same role. But they're available in Chrome and used by YouTube. At least in this particular case my understanding was that Google was pushing for the adoption of HTML imports as a web standard, which would have been better for all browsers, but other browser vendors balked and Google was forced to use JS module imports instead. AFAIK I know they are now discouraging any further use of HTML imports. This is a bummer because it's not possible to leverage web components without JS now. I'm concerned about a web monoculture too but so far Google has mostly done a good job IMO. Even Mozilla has done some pretty dumb things when it comes to web standards (unilaterally killing WebSQL, for example). I certainly can't think of any other big tech company I'd prefer to see calling the shots on the web.