really easy to overthink this since we are used to the draft being such a big social event for fans. But for the teams - other than the medical i don't think they really miss much. They can still do video calls and whiteboarding plays/schemes is still very possible remote. Just have to think ahead and set it up. Sure, you miss a little bit of proday work, but i think they like that more for the social interaction than physical results. Just see how the player responds to being asked to do things - are they enthusiastic, do they adapt/learn if the test is changed, etc. But now everyone is in that boat so it is what it is.
Having the draft go on has benefits as well - once drafted, contracts can be negotiated, playbooks shared, diets/workout plans can go out, conf. calls....it isn't OTA's, but there are still things teams can do with the rooks - just a little creative thinking needed is all.