Difference between "normal" semantic model and default semantic model in a Lakehouse?

Hi Anonymous ,

we've also checked that with a new PBI Semantic Model, created against the lakehouse via PBI Service, we can rename columns and tables to be more useful for the final users, and the same of the original semantic model. And it's really a semantic model, because it doesn't modify the physical name of columns and tables on the lakehouse.

So I'm very confused about the differences and limitations (why the default semantic model is so rigid, and why a new semantic model on a Lakehouse is not?).