Spouse adding on direct as a new member

[Stargazer65]

We were planning to add on a little more. All 4 contracts we have are in my name, two are direct so I have a blue card. But I thought it would be nice if DW had her own Membership, her own blue card, etc... Probably even a different UY anyway since she will on occasion travel with her sister, at a different time of year so we wouldn't normally want to combine the points with a transfer.

Anyone else do that? Is there any downside to that (other than the points can't be combined with mine)?