I think I am unusual in wanting (or rather recognising I want) T-Loop. And I get the feeling that a lot of aids either don't do it, or it is configured off.
I want it becuase in a resonant building I want to hear what the speaker is actually saying, not what the building is reflecting back. To put a local focus, i have been known to go into the centre at St John's church so I can ONLY hear wht the sound system gives me, not overlaid with a lot of reflection. I find that church better when they DON'T use the sound system.