My current employer would lose a lot of employees if they did that. People are already super stoked for when they can finally stop doing this remote work thing and be back at the office full-time. Not all, but a lot. They'll also lose people if they go back to "remote cannot work, you cannot do part-time remote", so they'll have the option to do a little bit of remote work, but set up in a way that makes it unviable in practice (e.g. meetings spread out over the whole week and held in a way that makes remote participation impossible)