So if you do 80% of your computing on a browser and 20% natively, then you still have no reason to be on a OS that doesn't do what you need for the other 20%. The right answer for light usage is whatever came preinstalled in your device (likely Windows, Android or iPadOS, if Chrome browsing is all you do).

So if nothing else is relevant that still doesn't make Linux THE go-to or suitable for mainstream usage. It's not preloaded in most devices, it is hard to get working well on the types of custom setups most mass market laptops ship with, it's less convenient or outright incompatible on the mobile hardware casual users prefer and it's extra work to set up in any case, which you're not going to do if you're a normie, because, again, all computers have browsers.

It's a bizarre argument to begin with, and it's definitely not the only thing that's "relevant".