That's a really good point. Humans generally don't like big changes, so removing friction to a big change makes it more likely. While remote work might make it a bit easier to fire someone, it totally makes it easier to leave.

Factor in that with the boomers retiring, the workforce is much smaller, especially among those with more experience. Unemployment is expected to stay low for some time (in the US at least), which means workers have more power. This is especially true for work that requires more experience or education. Those roles will be harder to fill overall, and the expected outputs are higher.

As a person working in a fully remote, global company... and as a hiring manager, I can attest to the challenges in hiring and maintaining a remote workforce. Hiring is tough, but keeping employees is also tough... because it is so easy to leave in a time of low unemployment.