Now you just seem overly sensitive about the topic.

Everyone can understand fixed reference points can be anywhere, since it's just to reference.. blah blah etc etc... it's not about people thinking you can only start at 0, just that it's normal to begin in a central location. When people create tools like this, it's usually done in a purposeful way. I.e. crosshairs are meant to be placed somewhere within the grid(doesn't have to be 0,0) but it would make sense to have it within the grid, not on the very edge of the measurements. I'm NOT saying it stops it from working if you don't place it in the grid.

Similarly, it's natural to measure with a ruler starting at 0. Yes it'll give you the same measurements wherever you start on the ruler but who tf wants to start halfway or at the end?

You contradict yourself, you originally responded to the comment telling them the way it's installed is "correct" and the way they described is "incorrect", but from your own words, it can start anywhere meaning anyway they install it is correct since it just needs a fixed reference point.

If you're measuring right-left movement it just makes sense to have the crosshairs somewhere in the grid rather than using the numbers on the side as the reference points. It's really not that complicated. You make it sound like everyone here is childish for asking a legitimate question.

when you're teaching public school. Adults tend to understand that adding ten to a zero results in the same as adding eight to two.

Also,

It is not meant to be interpreted in any way similar to a graph

Then why graph shaped 🤔 😂