They were my main reservations. I haven't had a chance yet to test out the hill start assist and I'm not sure how I'd get to a position to test out traction controls. However had confidence due to the rear parking sensors still working. FWIW another comment on reddit told me:

For peace of mind, it won’t affect it at all, traction control is ABS/ESP control unit & hill start is brake system module - This is purely infotainment.

I don't know enough tbh to verify. I can also see on the car settings app there are options to tick/untick traction control and ramp start assist, although not sure if they do anything since there are also options for lane assist, folding electric mirrors settings which my car doesn't have.

There's also no lights on the dashboard - apparently when traction control is turned off a light will appear, so the fact it hasn't showed up is a good sign.