Addressing comments on hearing aid technology:

Often people who lose their hearing want to be able to hear in social situations such as restaurants and family gatherings. In this context, the signal and noise have similar properties and are coming from the same direction. Directionality helps but can only do so much. Noise reduction can make hearing aids more comfortable to wear but don't necessarily improve comprehension in challenging situations. Progress here is fantastic -- at the same time it helps to have realistic expectations.

Putting the mic on the person speaking sidesteps the problem -- it's like the rest of the room isn't there.

That sounds awkward.

The tech for isolating a speaker at conversational distances exists. You use half a dozen microphone transducers (minimum; Crappy microphone transducers are cheap and quality is expensive, so just use a bunch of them), and through a combination of phase and intensity they decode relative location, and amplify that phase expectation while suppressing everything that isn't phased like that. Sound is slow, and readily susceptible to real-time triangulation. The math/processing is much easier if the parallaxes are fixed (eg the microphones are arranged in a line array on the top band of a rigid pair of smart glasses), but with a little latency it's not prohibitive for a deformable array to solve for its own relative position as well.

Least equipped to provide? They've been working on machine learning algos for exactly this purpose for twenty years.

That’s more a solution for far more extreme cases, including actual hearing loss. This would be far more involved than me lining up my ears with their mouth ;)