why do people believe that once mobile browsers are faster that magically native apps will disappear
I'm not sure that I've seen anyone suggest that. In any case, your point assumes that every app has the level of complexity that Photoshop, Lightroom etc. do and that's clearly not the case.
The simple fact remains that mobile web performance is sub-par, so every mobile web experience you've seen so far has also been sub-par. That doesn't automatically mean that amazing mobile web performance will result in amazing mobile web apps, but without trying it we won't ever know.
I'm not sure that I've seen anyone suggest that. In any case, your point assumes that every app has the level of complexity that Photoshop, Lightroom etc. do and that's clearly not the case.
The simple fact remains that mobile web performance is sub-par, so every mobile web experience you've seen so far has also been sub-par. That doesn't automatically mean that amazing mobile web performance will result in amazing mobile web apps, but without trying it we won't ever know.