mmmm This is how I got my parents to stop using their ancient iMac 5 or 6 years ago. It was no longer being supported by Apple and that was a huge security issue. My dad doesn't mess with computers that much, but my mom does everything online now. They were looking at getting a MacBook and I steered them towards iPads because Apple definitely was touting that whole "iPad can replace a laptop" thing.
For what my mom uses it for, it works amazingly well and it was close to half the price of a MacBook that they were looking at. There isn't much of anything really that she's found that she can't do with the iPad that she could do on the iMac.
MichaelJohn Nobody who's been following Apple's releases is mistaken that if they want a portable workstation, the clear choice in their lineup is the MacBook Pro. For students, the MacBook Air.
I am yet to see the iPad be promoted as a serious workstation by Apple, it wouldn't even make sense as it would cut into their MacBook/Mac Studio sales. The iPad is squarely located in the same place as any other tablet: something between a phone and a laptop but having no particular upside and a lot of downsides compared to the other two.
They were for many years. For a home user who just surfs the net and plays occasional games an iPad is the perfect laptop/desktop replacement. Someone who plays lots of Steam games, uses CAD, or uses Photoshop for a living is not going to to even look at an iPad as a replacement, nor do I think that is what Apple had in mind when they started this marketing scheme. It was marketed solely at home users and possibly students.
I actually used an iPad as a laptop replacement myself but after a while I did find it too restricting in many ways and traded it in towards a MacBook Air at the time. Only because I wanted to do some light gaming and not have to sit through tons of ads. Everything else I could have kept using the iPad for.
I would look at a GrapheneOS supported laptop (or really any laptop running Android) as nothing more than a tablet with a keyboard. For home users who just surf the net and find an iPad too expensive, it might possibly suit them fine. And the added bonus is if it was GrapheneOS supported they'd have the most secure OS on a laptop. But it's still Android and still has the limits of the Android ecosystem. I would hope nobody believes they could reasonably replace a powerful laptop with access to any program imaginable that can do anything imaginable with an Android tablet, phone, or laptop. But there are definitely use cases for these things and there very clearly is a market for it on some level.
That all being said, I think the chances of a GrapheneOS supported laptop are extremely slim unless someone designs the laptop around the requirements of GrapheneOS support. The chances of a company investing in that kind of system would not see a good return on investment because of how limited Android is compared to Windows, macOS, or Linux in general.