Telling mobile devs not to use web tech is an example of where this argument (request? demand?) falls down. There are a lot of advantages to using web tech (cross-platform, easier to develop, easier to push updates), and the result is not necessarily worse; it may be better. CSS is a very expressive and powerful layout language, for all its rough edges. Apple uses WebViews in their own apps (like the mobile App Store app).
The rough edges of web tech will only get smoother over time.
>>> There are a lot of advantages to using web tech (cross-platform, easier to develop, easier to push updates)
Yeah. This shouldn't be overlooked. In some cases (solo founder, bootstrapped, etc) a hybrid app might be a great choice for v1.0. Sure, it won't be fast on the phone... But it probably will be pretty fast to develop and release on multiple platforms. Especially if you don't have experience in iOS/Android dev but plenty of background in Web. Sure, if it gets traction you should rewrite it in mobile at some point. But as a prototype, I am totally cool with hybrids.
I'd guess these are not the cases that the OP meant, but still I wouldn't say that the web lost. It has fair share of use cases.
I think quite a wide variety of app devs might find it more important to be able to, say, develop an app faster than have a snappy start-up time, especially if there's no fundamental limitation at play but just limitations of the current tools!
I trust app devs to choose the best tools for the job.
The rough edges of web tech will only get smoother over time.