I think you’re missing the point a wee bit. No one (introverted or otherwise) is arguing against in-person socialising in general. They are arguing against forced in-person socialising with co-workers.
online meetings are extremely transactional
Exactly. You know what else is transactional? Jobs. The employer and employee exchange work for currency. Employees don’t owe their employer any meaningful relationships with their co-workers. I’m sure that means less efficient business. I also don’t give a flying fuck.