What percentage of long-distance relationships work out long-term? Do you become more or less close with friends after they move out of town? Do you still "know" them the same as you did when you regularly met in person for lunch or drinks? Is it awkward when you do see each other in person that one visit a year?
Human beings are social creatures - yes, even we introverts need interaction. A pure voice-only relationship can feel close, but it's not the same thing. Current technology like Zoom and similar is just not a good replacement for in-person interactions.
How many times have you spoken right over someone on a Zoom call or Discord server? The social queues are erased, and things become awkward and less productive. Creativity (which applies even in engineering) is diminished when you have to use online whiteboards and planning tools vs. a real physical whiteboard with everyone holding their own pen and bouncing ideas around in real-time. To use Zoom et al effectively, the pace of thought and contribution are greatly diminished into a sort of per-turn dance.
WFH is fantastic when you have a head-down, concentration-demanding task that is very clearly defined. For most other things, it's actually harder to get work done.
WFH is simply not a replacement for team cohesivity. There is a great deal lost when you do not meet in person with the people you work with on a regular basis - we can't just sweep that under the rug because we'd prefer to sit in our home office. We have to acknowledge the real tradeoffs - the loss of the "team".
That's not the say WFH doesn't work. Some people make an entire career working from home after all. It is simply an acknowledgement that WFH isn't as beneficial in all situations as you might believe.