>If you cannot train your juniors up remotely, that’s a management failing. Why punish them for that?
That's an unnecessarily aggressive and uncharitable read of the situation. While it may be possible to train up juniors remotely, many people (myself included) have given it a serious try and have found it far too risky to be worth the effort. An intellectually honest manager will say "it's not for me, I can't do it," and their higher-ups have to make a value judgment about whether it's worth it to force them into a shape that they're not, or accept that the tried-and-true method of socializing juniors in-person is still valid.
If you're honestly curious as to why it's so hard, my experience is that it's a socialization task: you have to make the junior folks feel like they're part of the team and have standing to ask questions. That's really hard to do when everyone is just words on a screen, or occasionally floating heads on a video chat. Embodied communication has something that gets lost online.
That's an unnecessarily aggressive and uncharitable read of the situation. While it may be possible to train up juniors remotely, many people (myself included) have given it a serious try and have found it far too risky to be worth the effort. An intellectually honest manager will say "it's not for me, I can't do it," and their higher-ups have to make a value judgment about whether it's worth it to force them into a shape that they're not, or accept that the tried-and-true method of socializing juniors in-person is still valid.
If you're honestly curious as to why it's so hard, my experience is that it's a socialization task: you have to make the junior folks feel like they're part of the team and have standing to ask questions. That's really hard to do when everyone is just words on a screen, or occasionally floating heads on a video chat. Embodied communication has something that gets lost online.