Describe the solution you'd like
A way to enable the feature from legacy where a skill level up shows a list of what it unlocks. Perks, tool use, maybe even block breaking. Perhaps have it configurable client side with a list of what types of things to show.

Why is this feature needed
So people get a better feel for what levels give as rewards as they get them.

Describe alternatives you've considered
Not having it (maybe have it off by default?)

Additional context
My cat's name is mittens.

I did ponder on this when i did the rework. On one hand, i 100% agree with your point that it helps levels feel more significant. On the other hand, the issue I encountered had to do with NBT items. Since they are all one item but the NBT could have wildly different requirements, there was not clean way to include those. I could omit them, but I was holding out for a better system of identifying NBT-configured unlocks.

Maybe only have it trigger for item use for items you're currently carrying? That way you have a known set of configs for NBT code to parse over.