I do not know how much this counts as ‘beside laptops’ but I would most like to see a 2-in-1 convertible version of the Framework laptop (ideally using the same motherboard standard) with stylus support. Pen input is quite essential for me to sketch diagrams, blueprints or just help me organize my thought. I have mostly used HP x360 series 2-in-1s, which have a nice feature set (reasonably bright display, a touchscreen with Wacom AES active pen and a matte glass finish, built-in 4G LTE). At the same time, the current 2-in-1 market is extremely frustrating. You are usually limited to Intel CPUs (and weaker ones at that) and soldered memory (usually 32GB) max, both of which seem quite limiting to me.
I am personally not quite convinced that the “flip” (360 degree double hinge) form factor is the optimal one (converting between laptop and tablet mode is slow and cumbersome) but I get that it is the easiest to make and I’d be fine with that. I’d be fine even with just a pen-enabled screen in the current clamshell form factor. I even looked into DYI-ing using screens from major-brand convertibles such as HP. But given the lack of documentation and official ways to source parts, this is hard. And I am not the only one interested: 1, 2.
For me, the best 2-in-1 form factor I saw was the Sony Vaio Duo, which I was able to switch from tablet to laptop mode with one hand, in which I was holding it. The HP Dragonfly Folio form factor also seems intriguing in some ways (however, it cannot be fully closed in the ‘screen up’ orientation to become a proper tablet and also the port selection is abysmal).