I just got my first pair of HAs in November and I opted for the T-coil enabled model. It also (already) has working Auracast (not just "available in a future firmware update" like the other mfgrs). The T-coil model was not much bigger than the one without, and it also had two buttons on each unit rather than one on the T-coil-less model.

411, "Loop systems" are hard-coded in the US's ADA (Americans with Disabilities Act) so they are not going away anytime soon. When Auracast does proliferate it'll be alongside loop systems; not a direct replacement. (Not at least until the law is amended and we all know how long that takes.)

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My HA model is the Starkey Omega 24 RIC-RT (the `mRIC` is the smaller version of the same, sans T-coil).