I don't think so. I'm sure I'm not the only one who really enjoys the convenience of managing all of my payments and subscriptions in one place in the Settings app.
EDIT:
You can downvote me all you like, but you need to deal with the fact that the end user's experience is more important than a bunch of devs who think they are entitled to be free riders on an App Store that is most certainly not free to develop or maintain.
It comes down to how much you're spending. People are spending hundreds of dollars (some spend thousands) on Genshin and other gotcha games. If you're spending hundreds of dollars and you can get 30% more virtual currency for your money then you're much more likely to go out of your way to do it.
The IAP model became dominant on mobile largely because of Apple's store policies and their refusal to allow other forms of distribution. Meanwhile Steam and many other channels are largely pay-once, and they exist only because of the developer freedom that you decry.
No, the IAP model became dominant because the unwashed masses can’t be bothered to spend a few dollars or even just 99¢ for a copy of software that oftentimes took many months if not years to develop, to say nothing of on-going support and maintenance costs. Too many people (in general) are just flat out fucking cheap and too many devs/companies are willing to resort to stuffing every app with ads and tracking.
It's so hard to find anymore. Digital board games are one exception, there are a lot of really excellent ones with great replay value for a fixed price. Scythe, Root, Spirit Island, Railroad Ink, Wingspan, Through the Ages, Galaxy Trucker...
It's even worse when you have kids... your toddler gets upset because the very fun looking princess puzzle she's trying to play "is broken." In reality, it's just pay-walled.
> but you need to deal with the fact that the end user's experience is more important
The end user is completely toxic as a result of the App Store. I cannot buy books in Amazon's app, because Apple think they are entitled to rent seek on it. We've ended up in a word of crappy gambling simulators instead of sensibly priced paid software because Apple engineered the store that way.
I certainly don't want the App Store to become the more or less anything goes Google Play Store which is still riddled with malware and shovelware.
One of the reasons why I enthusiastically continue to choose the Apple platform is that Apple has standards and gives an actual damn about the end user and having actual platform-wide standards and conventions instead of letting devs do whatever the hell they feel like à la Windows or Android.
is that convenience worth paying 30% more? (assuming apps are allowed to have different pricing outside the app store). I think it might for apps you're unsure about at first and want the ability to easily cancel, but for things you're paying for for years? You probably wouldn't mind going thru a stripe web flow for some savings.
Convenience a big part of it but not only thing. The platform owner needs every big club available to it to keep developers in line with the platform rules and conventions.
Otherwise we would end up with something along the lines of the growing Electron cancer that macOS is affected by.
They could also do this by exposing get subscriptions and cancel subscription APIs that other payment providers/apps can implement. Just like the share sheet, there can be a pay sheet.
EDIT: You can downvote me all you like, but you need to deal with the fact that the end user's experience is more important than a bunch of devs who think they are entitled to be free riders on an App Store that is most certainly not free to develop or maintain.