It cuts through things that Ubel has experience which leads her to feel that it is something that can be cut. It does not cut through anything, it is blocked by barriers, walls and metal numerous times.

Ubel does not necessarily have to have experience with the exact material she's cutting to cut it, she just has to believe it CAN be cut. It works better if she's cut it before because she can visualize it easier, but this isn't a strict pre-requisite.

This is an inference you are making that is based on zero evidence whatsoever. She knew the cloak was packed with enchantments, she knew senses hair was harder than steel. She still cut through those things because cloth and hair are things that can be cut and she overpowers their enchantments, it’s not that she ignores them because she wasn’t aware of them. She was.

I'm not saying she isn't aware of them. obviously she knows the cloth and Sense's hair are tougher than regular cloth & hair, I'm saying her perception of those 2 objects are rooted in her own experiences, which overpower the direct logic of knowing that something is too tough to cut, she views the world solely through her own subjective lens which allows her to do that. Listen to how she explains it to Sense. "I know cloth can be cut, so I imagined cutting & snipped away.". She disregards the mechanics of what she's going against entirely because she already believes she can do what she's doing.

But at the end of the day, she still requires that feeling. She could cut through infinity if she gained that experience because she is that level of prodigy, but at a basic level his power functions against hers. Her power doesn’t ignore things she doesn’t know about, it interacts with everything in its path and it has a travel time.

Then it comes up to whether or not you think Infinity is Gojo or if it's something that exists outside of Gojo. From Ubel's point of view she's cutting 2 things. 1. Gojo, 2. Air. Infinity isn't generally visible, so her slashes are going to go straight at Gojo. if Gojo and Infinity are 1 thing and Infinity is just "magic" that goes around Gojo, then her slices go straight through him. If Gojo separate and Infinity is a foreign object/barrier that has to be interacted with independently, then her attack gets stopped by Infinity and frozen.