Are you trying to make some sort of joke here? How is the Web more open than Linux or the BSDs running FOSS applications? And in fact how is the web under Chrome any more open than macOS or Windows? Seriously. In all cases, you can't just freely modify everything about the platform you're running on top of or most of the "applications" you're running. There's a megacorp behind each whose interests may or may not align with yours. You don't get to choose what they do or how. But you can still make whatever you'd like on top for no cost, though you may have to spend money to get attention. And if you make something malicious, you might get added to a blacklist that is distributed to all users. Etc.
In essence Google wants our "operating system" to be Chrome or another of their properties, either as a sort of meta-OS layered on top of the hardware OS or more directly via Chrome OS/Android+Google Play Services. And their financial interest in that is almost exclusively to get data about us to run ads at us, and to the extent possible prevent or hinder avoidance of that harvest or those ads.
It's not just that I don't want an ad company to make my operating system, I don't want an internet-required OS at all. And I want a wide variety of software with zero WAN dependency beyond maybe initial delivery somewhere in the chain. If that's not something you're interested in fine, but lots of us will remain willing to put our money where our mouths are on that one.
I also disagree that Safari is "holding the web back" because I like simple, readable and parseable websites.
I couldn't agree more that Google's dominance in web technology is a problem. But you're throwing the baby out with the bath water.
And just to add, the current situation is still better than proprietary native apps on MacOS and Windows. I can at least use Chromium in many forms and on virtually any operating system. Not ideal, but the alternative people in this thread are suggesting is far worse.
There's a wide panoply of programming languages that can be used on Windows PCs, including specifically to make user interfaces, which are cross-platform, like Qt.