A headshot would be of exactly zero value to me. I have no photo on linkedin or any social media. In fact, zero photos of me online.
Current work asked me to upload a photo for the company skype / whatever. I told them no. It's completely pointless.
If a company wanted a photo for me to apply for the job, I wouldn't apply.
Judge me on my history / technical skills / personal skills etc at the interview. My face is irrelevant.
I agree with your point about job interviews, but in your job, a photo is far from pointless. It helps people you only work with remotely to stay empathetic, and not reduce you to a faceless attributeless character (which is the image placholder photos transport), among other things.
It seems to me that you haven't accepted this fact of life.
Honestly, I try to go into the office as little as possible.
I don't need a photo to help me trust someone though, I judge my colleagues on their work, I couldn't care less what they look like.