Since when did anyone ever complain that youtube, google maps, roblox, or any other web sites didn't have native buttons and UI patterns?
Are you implying that the Windows, Mac, and Linux native desktop user interfaces don't all totally suck??! Or that there wasn't a huge celebration when Alan Dye finally left Apple for Meta? Or that users are clamoring for Jony Ive's infamous shallow superficial visual elegance over affordance and discoverability and usability?
Is it just too confusing for people to use youtube because the buttons don't look and feel exactly like native Mac buttons on the Mac and native Windows buttons on the Windows and whatever the kids are using on Linux desktops these days, therefore nobody uses youtube, and that it will only ever get popular if it just had a native look and feel?
Basically you're saying websites are the same as apps, and whether they're used in the browser or as a desktop app, the UI is fine to ditch that of the OS. Fine if you think so. I'll be sad to see OS and apps diverge completely in terms of UI.
YouTube succeeds for its content. Its UI is hot garbage both in the web and their apps. Google Maps is an atrocity and I’m very thankful Apple has decent data where I live. Roblox I don’t know, other websites I consume mostly in Reader mode.