I haven't used telecoil since I had analog HAs, probably. I learned about the even lesser-known DAI (direct audio input) option before I got my first pair of digital HAs. Since then, I've used cables, and almost as long (15+ years now) have had modified pairs of bluetooth headphones:

https://hackaday.io/project/1406-bluetooth-headphones-for-he...

Sadly, it seems modern Phonaks (and probably everyone else) no longer makes DAI "boots" for their BTEs.

I'll probably be ok with the transition, but it's going to annoying having to recharge hearing aids during the day. Right now, I can get 6+ hours of music/podcast/meetings/phone calls on my (5+ year old) headphones batteries, and can take those off and charge them when not using them. (and other perks...)

I'll have to refresh myself on telecoil to see if it's of use. (My BTEs still have it, iirc)