what's all this NATO equipment done?

Stopped Russia from taking over Ukraine.

These new weapons have done nothing to shift the front lines

That is correct, they're intended to prevent Russian advances, not to support Ukrainian advances.

There is a non-zero risk that if Ukraine was given full offensive support, they'd try to take over Russia... or at least a chunk of it... which would self-justify Russia into using nuclear weapons, something that most people don't want to see.

Ukraine needs artillery, ammunition, drones, and supplies

Supplies, they're getting. There is a problem with ammunition though; since Ukraine is using Soviet era weapons, they are non-NATO caliber. Most of the stock of Soviet stuff that Western countries had, they have already shipped to Ukraine. In order to ship more, Ukraine will need to switch to NATO gear, which means basically re-arming the whole country from scratch.

It is no coincidence that Russia would become buddies with China, India, or North Korea, they're one of the few countries left producing some Soviet-compatible ammunition and gear.

All of this also means a NATO-ification of Ukraine's armament, which is something very desirable for NATO, and in particular for the main NATO weapons producer: the US.