I was always under the impression that the reason they seemingly crippled the iPad Pros from functioning as full-fledged computers was to prevent it from cannibalizing MacBook sales.
That's why the latest iPads, with their M4 processors, always felt like overkill for what you could realistically use the device for. I've got an old iPad Pro 10.5 that's 8 years old at this point, and it still works perfectly for my use cases (drawing tablet with Procreate, GarageBand, watching YouTube, etc.).
They were never crippled, there were just no apps making use of that performance at that point, their vision's still the same as it is today IMO. Now there's a lot of pretty good apps for video editing, CAD, etc.
Of course we computer enthusiasts feel the iPad is still restricted in a lot of ways, but a lot of younger consumers genuinely want the iPad experience, which is why I presume this new feature can be toggled on and off, and why we're probably never getting macOS on an iPad.
I don't know about that Mermaid thing others are talking about in the thread so I can't compare but D2 is very easy to learn the basics of and get started with. Like a few minutes from install to your first diagram kind of easy.
Until that D2 wasm port is officially released, I don't think it's even fair to call D2 competition to Mermaid, it's on a complete other level of useability. I'm glad to see that it's close to releasing.