Going "Vader on DS2"/"Yoda and Luke"/Vader and Emperor on DS2"/"Ben and Luke" would definitely feel weird to me.

But playing out the entire sequence on Degobah takes soooo long that I think it works going "Vader on DS2"/"Luke on Degobah, finishing training, seeing Yoda die, learning for sure that Vader is his father and that he has a sister and that sister is Leia"/"Vader and the Emperor on DS2"

Remember the impact of all that happens on Degobah-- it's massive.

Having the audience just set it all aside while we go off to Tatooine is not necessarily giving them what they want.

After I find out about Vader for certain, it's a real treat to see him again welcoming the Emperor. Let it play out for you once maybe?