GPS is exceedingly accurate compared to cellular signals on it's own. What it isn't is fast. So the "enhanced GPS" is mostly just proving satellite ephemerides so your GPS device can lock onto the overhead satellites faster.

If your device has zero GPS signal then you can get ~100m accuracy from the cellular signals alone. If your device doesn't have "enhanced GPS" then you can get ~1m accuracy from the GPS signals alone.

I think towers were historically already much more accurate than 100m in urban areas.

Note that this changed with 5G beamforming. The new towers have a much better idea of where you are. (My understanding (thanks to other HN commenters) is that technically it's possible to do beamforming without deriving precise 3D coordinates but that this isn't how it's done in practice.)