Compounds and [[Template:affix]]

I actually had the same idea you did, but didn't want to implement compounds just yet. The reason is that a compound is not necessarily any word composed of two or more whole words. There are, I think, several entries which use {{compound}} with terms beginning or ending with hyphens, but are probably still compounds.

Look at the transclusions for Template:tracking/compound/prefix, Template:tracking/compound/suffix and Template:tracking/compound/interfix for a full list.

Okay, this condition may have some false negatives. Has it got any false positives?

Also, I think these tracking lists are not very useful at assessing the accuracy of this check. They contain doorzettingsvermogen (obviously a compound, and would be detected) and poniedziałek (false compound, and would not be marked as such), and probably more such examples.

And why not put this comment at Template talk:affix? Or BP?

To find any possible misdetections, you would have to copy the detection code to the {{compound}} function in the module, and track any entries for which the detection does not result in "yes this is a compound".

Here it is: Special:Whatlinkshere/Template:tracking/compound/looks like confix, Special:Whatlinkshere/Template:tracking/compound/one whole word. It seems there are not so many of them, but I guess we have to wait until the job queue goes through it all to be sure.