I still have to see a single webapp that is as performant and feels the same as a native one. We might get there, and lots of companies are happy to release a half-backed webapp today, but that is definitely not the experience today.
I could post a mini saas that I made in php and mysql, using jQuery on the front end, that outperforms just about any webapp and most modern local apps, but I don't want to attract too much attention because I'm sure technically it's easily breakable to pros and malicious people.
Also, it runs on a $4 a month namecheap server.
Why is so fast? Because I came from the land of slow crms, and performance was my #1 goal. Instead of making it faster to develope, I made it faster for the end user.
Is that a worthwhile business goal? I don't know. But I know it's fast.
Render speed of browser engines is really good these days on mobile phones. Getting fluid animations is maybe even easier and faster with css than with the Android sdk or ios. Plenty of frameworks out there to create nice SPAs.
Some parts still have to be native like Auth, billing etc. But majority of the app can be web.
