I (and other people) have already said that re-buying the same products and learning alternative ones is expensive in both time and money. That’s the point.
And I don’t know a ton of iOS killer apps but you would probably have to convince people with a ton of effort that Procreate is replaced by something on Android, let alone any other app I don’t know about
I… Don’t like Apple at all. I’m engaging in a thing called a thought experiment, which is required to rationally assess why somebody might not want to throw away things they have purchased and devote both more time and more money to something that doesn’t work as well as it.
So I don’t know what all the cool killer Mac apps. Replace Photoshop with the name of a bunch of cool killer Mac apps, and repeat the question.