I'd never heard of it, but followed your link and started considering it immediately. It looks very good, and maybe a bit quieter than the other coast to coast!
That's the main problem with most of the longer distance routes for me - they get boring once you start walking alongside roads and loads of them seem to do that for a substantial part of the route. Perhaps I'm spoiled, but after walking Hadrian's Wall years ago I've decided I'd rather leave a long distance route unfinished than spend time walking alongside traffic - would rather keep to the 'good bits'. Definitely the quieter, more scenic variety are best.
Never heard of it before, but it looks like a very appealing route. Sty Head to Langdale, High Street, High Pennines, Cheviot, River Tweed - great stuff. Me being me I would be tempted to modify the route, particularly to take in Cross Fell.
Not sure about the airbnb bit right now though, but hopefully things will settle down eventually (goodness knows when).
For sure, going past a half dozen tarns during the first couple of days and then getting through the Eden Valley and into the Pennines as soon as possible tempted me. Cross Fell should definitely be included, you're right, and could be potentially an extra day of bimbling around the Pennines away from any roads which would bring you out a little further west on Hadrian's Wall for my liking - but agree, overall it's the remoteness of much of it which appealed.
Also occurred to me that there are a significant number of Roman forts en-route. Eskdale holds a roman fort, High Street is known for being a roman road which linked between forts and of course Hadrian's wall may make it a bit of a mini tour of the northern forts if I have time.
Not sure what to think about accommodation at the moment, agreed, but hopefully once it becomes 'de rigueur' to properly clean between guests I'll have a lot more confidence.
For those interested: