I encountered something similar recently. I put a lot of effort into making a PWA mobile-optimized version of my product which is effective an app in a browser. And I was flooded by user feedback saying they simply would not use the product until there was an app available. There is little option but to create an app in this environment, or face disinterest from potential customers. And the internet is shockingly mobile-focused nowadays, 80-90% of traffic is coming from mobile devices. So not having an app is death for your business.
Apple will also not approve a straight web browser in an app wrapper, there's a specific rule that disallows this, so you have to make some good faith effort to implement it natively or not be allowed on the App Store.
Apple will also not approve a straight web browser in an app wrapper, there's a specific rule that disallows this, so you have to make some good faith effort to implement it natively or not be allowed on the App Store.