Apple says web apps from third-party browsers are a security risk.
Apple is officially dropping iPhone support for web apps in the EU - The Verge::Apple will no longer support web apps in the European Union in iOS 17.4. The company says building the feature would be “impractical” on top of the other changes it’s been asked to make.
I doubt that web apps use less power then native apps. Especially because native apps can be entirely compiled to the architecture.
It always depend on the software in question.
By dropping pwa they most likely prohibit an api to use any os interface at all. PWA additionally circumvent their store.
And therefore steering developers back to their known ecosystem - which requires apple hardware to develop on.
Additionally it may "preserve" the dedicated knowledge to develop against their os.