The main issue is not the exorbitant commission rate. Apple is hurting the consumers via its anti-competitive behavior with regards to what apps people are and are not allowed to install on a device that they've paid for. They are blocking value creation up and down the stack in a manner that "if we can't extract it, you're not allowed to create it."
It's intolerable that Apple has been allowed to lockdown their device for 10 years, completely control the market for apps and when it looks like regulators will take action they reduce their price and claim to be acting in the interest of small business.
Third party app stores must be allowed. Apple should not be allowed to dictate what software I can and cannot have on my device.
Practically speaking, the only big thing a web app can’t do on an iPhone that most app writers would like to do is notifications. Most other locked down things like call recording aren’t available to App Store approved apps either (and APIs are being removed from Android)