Varsho just isn't a good enough hitter to justify dragging on the roster just as a DH and occasional PR. He has a career wRC+ of 98 against RHP, so it's not like you could maximize him in a platoon, and if he's not fully healthy you don't want to run the risk of him getting a setback from running the bases or something silly. Also there just isn't many hitters you would expect him to be better than. All of Bo, Vlad, Springer, Santander, Kirk, Gimenez are better hitters, Wagner projects much better, Loperfido projects fine in a pinch and if Straw is (on the roster and) starting he could be the late-game PH replacement if necessary.
Let Varsho get fully healthy, it already looks like he's making great progress and should hopefully be out for not much time in April.