I'm surprised about Alderley Edge being omitted; when the paths were first defined in or before 2018 they required the service to be semi-fast to give enough turn-around time at Crewe, and indeed generally prevented Styal calls because of this. But the post-2018 timetable seems to have sorted this out, and whilst I can see why Chelford and Goostrey don't get calls I'm surprised if Alderley Edge doesn't.
If the service had existed years ago when I used to go to Birmingham frequently then, yes, I'd have used it. I avoided the dreadful overcrowded XC services even though going via Stockport is a permitted route, and I'd use connecting services into/out of the Birmingham-Liverpool services at Crewe.
As for travelling by train to airports, I can only say that my experience will hardly be unique in that I've used the train to Liverpool, Leeds/Bradford, Birmingham, Gatwick, Stansted and Heathrow airports in the past from quick memory. For me I'm happy taking a train for a single hop journey in preference to flying from my very local Manchester airport and having to change. Ironically I've given up using the train to/from Manchester Airport because it became too unreliable and pay for a taxi instead nowadays.