It looks like you think  Im glad that has sunk in  These are synonyms for the main topic Theyre synonyms that appear to have arisen from international conventions Have you ever worked on EU standards bodies I have Theyre not trivial spelling variations theyre linguistically quite distinct It is not obvious from one name that the other exists A reader searching for one name will not easily see the others This category  is far from lightly populated it contains over  entries so far  a page full of text too much to easily eyeball There are  redirects pointing to this page most are as you suggest trivial spelling variations of metremeter These are not categorized Noone is trying to categorize them Those which are categorized are the three quite separate linguistic stems Besides its a big topic and has potential for even more growth if editors expand it  You claim a dogmatic policy a category should not be placed on a redirect if the target article has the same category applied to it  Yet this is simply your invention and is no part of the relevant guideline Policy is not invented ad hoc to suit by editors even you  Yes I want to waste time on a heavily redundant categorization I feel sorry for the poor CPUs and this extra workload but thats just what theyre for Better to waste the time of some silicon than a readers As far as human effort goes listing these alternate names visibly is justified by both our guidelines and the likely use cases of readers  you arent terribly familiar with  Ive a fairly large WP edit count My Mediawiki edit count dwarfs yours and I work on Mediawikis where categorization is used unlike WP Lose the patronising Im an admin youre a newbie attitude