Well sensor size and not video resolution is the driving factor to the physical space required by a camera/sensor package. Just because others haven't done it yet doesn't mean it can't be done. You get a tiny enough sensor (Yeah I know bigger = better here, but the point stands) you reduce the requisite surface area.Which other laptops on the market have a 1080p webcam with thin bezels?
The goal of the new MBPs were to address the biggest issues:
1. Lack of ports
2. Poor webcam in WFH times
3. Bezels that make it look like its stuck in 2014
Apple fixed all of these with compromises. The notch is a compromise. If Apple didn't think the notch was a compromise, and was merely 'branding', why did they reduce the notch on their newest phones?
It's a design statement, and if Apple's design team really wanted to do it with smaller bezels than last generation they could have.