The Mandalorian and TBOBF combined makes sense because TBOBF is essentially Mando season 2.5, but since they don't have any overlap with Kenobi series (and I doubt they have overlap with Andor) I think keeping them separate is fine.
Though I am supporting the combining of Mando and TBOBF.

As for combining Anakin|Vader, it's fine by me. I think when it comes to requests everyone can specify in their requests which aspect of the character they prefer for the pairing he's involved in, if it plays a significant role in what they want.