We are going to have a massive problem with taking on juniors, particularly younger people. Without many people visiting the office, there is a lack of banter, encouragement, confidence building. Imagine you were 16 and your introduction to the world of work was sitting in your own bedroom!
Honestly, I don't know how we deal with it unless we create a schedule where there has to be certain people in the office on certain days so that a junior can get the interaction and support which is as much of job training as anything they can do online.
So that's one example of when can do != should do