Above was written: "the only people who do it are old blokes who come from a windsurfing background."
Yup, that's me. I finned for 30 years then switched hard-over to winDfoiling in 2017 and haven't looked back. I'm not interested in winGfoiling.
As I get older and weaker I really appreciate that I can now winDfoil in light conditions with a 7.0 that used to require 11.5 on a big slalom or formula board. My favorite size is 5.0-5.2.
I live in the far east Gorge. Cold here now; 21 degF. I have friends in Florida who still fin with big gear and weed fins. Many of them also kite with fins. Foiling is doing OK in Florida but shallow waters everywhere require judicious choice of foiling spots where the water is deep enough.
Within the foiling side of things, yes, you do see some winGfoilers, but the finners still dominate (both sail and kite).
That said, in Hood River on a nice summer day it is not unusual to see 300 winGfoilers, 4 winDfoilers, 4 finners, and a few dozen kiters.