Any hardware issues (mind you, the failure rate is pretty high, especially keyboards), and you're left with a broken device.
I won't be putting all my chips on Apple either. I have a mix of file storage options, password managers, Linux laptops, 'hub' devices, and so on.
What's unsupported about it? I picked this up on a fire sale and it still gets updates.
I have a specific use in mind, leveraging on-device speech recognition. Ideally I'll be able to achieve parity with the iPad.