The Great Resignation is well-understood by leadership, and has been in varying stages of accelerations since RTO.
This isn't a TMUS phenomenon, it's the post-COVID reality in many industries.
There's a healthy bit of introspection in there, however: No matter how enthusiastic you are as an individual contributor, nobody above your boss's boss is likely to ever hear about you except when annual awards go out.
We work to live, we don't live to work. A healthy balance will serve you far better in the long run than zealotry to a corporation that ultimately sees you as a means to an end.
Legere himself has been the hatchet man in previous companies...Executives will ultimately do whatever they become convinced will move the business in the direction they want to go, and the well being of the employees are rarely at the top of that priority list.
The real trick is refining your personal toolbox and brand so that when a corporation discards you, there are ten more chomping at the bit to hire you!