https://amp.businessinsider.com/time-spent-mobile-browsing-v...
https://amp.theguardian.com/technology/appsblog/2014/apr/02/...
Even though they are old, the trend at the time was clear: people are spending more time in apps (most of which are probably native) than on the web. The idea that the web is universal and what most people spend their time on isn’t a fact you have established.
Web technologies are loved by developers for their speed and ubiquity. But as a user, I strongly prefer the feel of mobile apps for my day to day interactions. I find the web, particularly on mobile, to be a mess. The interaction models are all unique and confusing and typically not well implemented, while native UI widgets work well and are understood.
I don't have numbers to back it up, I have a lot of anecdotal evidence I've seen, but it does look like there seem to be at least as many people that don't care what widgets an app uses, so long as the app works, as there are people such as yourself that even notice native UI widgets and care about them (deeply and vocally, as often the case may be).
(Arguably that's a problem with Flutter too because it isn't "native" nor "web", it doesn't entirely meet the expectations of web users currently either.)
For better and worse, the web is a ubiquitous platform, and I think getting to be just about the only platform that matters today, regardless of the remaining fan wars between the "native" platforms.