It's not that diving CCR is too difficult, have a motor boat [also gave up sailing 'blow boats'] , don't dive doubles any more also, which I did for many years, there comes a time [and age] when you say to yourself 'keep it simple, easy' blow bubble and just enjoy yourself.
Alas that day will inevitably come when decrepitude arrives, one's body breaking such that the diving's too difficult. Could be knees, back, or goodness knows what.
Then you'd sell the dive kit and buy a sailing boat. To sail to Valhalla!
As for sailing boats, they are holes in the water you pour money into [my motor boat a little less so, just].
Rebeathers are a great tool for the required 'job', not required now.
Odin is waiting.
Sorry for going way off topic .