Laughable; phones have worked for decades. Your brain and mouth and ears don’t stop working, do they? Furthermore you are greatly overestimating the proportion of high intensity local collaboration to grunt work. The vast majority of tech jobs could be remote overnight and nothing would even slow down. These jobs are not hard or collaboration intense regardless how cool your employer makes you feel about coming into the office. It’s just hard work like any job, and in person collaboration is a miniscule part of that. In reality people like their offices and that’s 100% fine, just don’t ask me to move to your city so you can feel more comfortable asking me how something is going or what I think about x idea.
I think acceessibility is a broader issue with remote work—remote desktops don’t play well for the blind.