Ultimately, these mandates are because executives don't work for the same reason normal people do. Most people work to support themselves. But a single year working at an exec at a major company will be enough to let you retire very comfortably, never working another day in your life. Once you have ten million in the bank, you're not really working for money anymore.

Instead, you're working for prestige and power. Execs and high-level managers work for a few reasons. Some work because they want to have power over people. They get a thrill out of having complete authority over other human beings. And sociopathic need to control others is an itch that simply can't be scratched by working remote. Others like to mandate in-office because they're professional shmoozers. They do very little real work. Instead, they just go from meeting to meeting, spend afternoons golfing on the company dime, etc. The company is basically just their own personal social club. Others work because they have a savior complex. They think they're God's gift to mankind, and they need the sycophantic praise that can only come by forcing people to work in person. Finally, some are simply sexual predators. For some, the primary benefit of coming into work is the ability to coerce sex out of their underlings. And it's hard to sexually assault an employee who is working hundreds of miles away.