No it's not. Hosting a web app is one of the most trivial things you can do these days, far more trivial than attempting to get an app into the app store. Hosting API's and Databases is a little more difficult but you still need those things if you're building an app.
There is no world in which getting your app signed, getting it approved, getting every update approved and paying $X/year to Apple or Google is easier than hosting a webapp, even if you host it in the most difficult way possible (on say AWS + Cloudfront). And even that method isn't that difficult, just moreso relative to other ways of hosting a webapp.
Open Safari, navigate to the web app, tap the Share button, scroll down, and select 'Add to Home Screen'.
Except it seems like plenty of apps these days are just vehicles to give web-based services some native abilities, so they're practically useless without a data connection.
Shipping a local app eliminates a lot of those headaches.
Make your website static and host it on a CDN. There's nothing expensive or thankless about it.
Stop over engineering.