>>1
参考：
1. デスクトップOSアプリケーションは、一般にブラウザーベースのアプリケーションに置き換えられますか？
https://www.researchgate.net/post/Are_desktop_OS_applications_going_to_be_generally_replaced_by_browser_based_applications
2. ブラウザは新しいオペレーティングシステムです：
https://www.techdirt.com/articles/20080530/0022021266.shtml
3. ブラウザがユニバーサルOSになりつつある10の理由：
https://www.infoworld.com/article/2609165/10-reasons-the-browser-is-becoming-the-universal-os.html

リンク先 1. の回答を抜粋:
[A2]
Tom, look back at the testimony regarding the Consent Decree between the US Governmentand Microsoft.
One of the fears that Microsoft had was that Netscape's browser would make the Operating System irrelevant.
It is why they implemented IE to use a library that was also integrated into the Windows kernel.
Any changes to the browser also required changes for the OS.
[A3]
Yes..It is already replaced. CloudOS is running in browser and capable of operating all the applications.
One good example is 'EyeOS' which operates more than 67 applications such as Adobe , Word , Excel , PowerPoint , Paint, and Media-players Etc just on browser itself !!!