Hello again Tizer. I hope you have a successful op. I had a corneal graft 30 years ago and with glasses was getting 6/9 to 6/5, depending on the day(!) things have certainly moved on a bit since then. Recovery times are considerably reduced, and you don't have to spend time laying on your back in bed after the op..
Maybe the CAA are being cautious because they have the luxury of being able to, or maybe there are other clinical reasons. It probably doesn't help much, but having 6/9 or better after a surgeon has been at your eyeball is nigh on miraculous.
Absolute best of luck to you!