iPad isn't "held back" by anything. iPad is exactly what it needs to be. The only people who think iPad is "held back" are the people who have some unsubstantiated fantasy about the iPad form factor taking over the world of computing. This is never, ever going to happen. This is not an eventuality, or an inevitability. iPad has it's place in the world. It's a primary device for lots of people whose needs are simple enough that they don't need a computer to begin with. And it's a secondary device for people who want, but don't need, one. And it's a highly affordable product. As such, it's a $35-40 billion a year business. It's not missing its potential, it's achieving it.Yeah, the iPad is already the Apple device most held back by software and interface limitations, so it feels a bit weird to base their next generation of computing on their most hamstrung platform.
Vision Pro's biggest problem is that it is essentially an iPad, without any of key tent poles of iPad, like affordability or portability.