Yes, it is an odd discussion and, because of that, one that I have been loath to become involved in. FWIW, back when I was doing wheel alignments, and lots of them, Toe was always designated as a 'linear measurement', usually in fractions of an inch for most of the vehicles that I worked on, and it was never an issue. The equipment I used, from the very basic to the most sophisticated computer types, had both linear and degree scales so the issue in this thread is really a non-runner. What's more, there always seemed to be some sort of conversion chart on hand, supplied by the equipment manufacturer, so there was never a need to deal with trig functions. Failing that, these days there are internet options of which I supplied the URL to one such in a past post.