Absolutely not. You now have a computer where you have chromium’s flaws for your daily internet browsing and Safari(or whatever native browser is on the OS)’s flaws for the native apps that use the native browser.

Yes indeed, you’re still free not to use these apps. But would you? At some point why not get a computer where the internet is the “OS” (a chromebook for instance……… where guess what? you cannot use an alternate rendering engine. Interesting, no?)