I think the whole industry wrecked our posture, and it goes back to the CRT era.

The CRT monitors were big heavy things that sat on the desk. There effectively wasn't much manoueverabilty in a CRT stand, and only the expensive/later models had them. The CRT was below eye level, so we all tilted our head forward and looked at a downward angle

When flat screen monitors came along, the didn't originally stray far the the height the CRT's were at, but monitor stands slowly started to increase in height over time and things are a bit better now - and the additional options for mounting them in various ways has improved things immensely.

When you're seated or standing at your desk with correct posture, the centre of your monitor should be the same height as your eyes as if you were looking into a mirror. In fact to compensate so many people are looking down at their phone screens we could possibly put the computer monitor even higher to balance things out.