If the senior developers are grumbling about not wanting to be in the same room as their coworkers, I wouldn't be surprised if the junior devs feel nervous about asking for a few minutes of their time.

It is the job of senior devs to make new employees feel like part of the team.

Even worse when you're in an isolated zoom meeting with a senior dev, and they're talking trash about other developers on your team. There's constructive criticism, and there's macho posturing by fucking douchebags. Even worse when you mention it to management, and they do nothing.

In addition to this, I can wholeheartedly recommend 'screen control sharing' (maybe there's a better name for the category of software I'm referring to?) such as Tuple or Drovio. Being able to pair program with two sets of input devices for the same screen is kind of revolutionary, actually, and has been a key part of collaborating remotely for our team.

They can be solved, but they often aren't. A lot of things that happen implicitly and organically in person need to be explicitly planned and scheduley in a virtual environment.