@old man
The problem isn’t that it is “hevel”. The issue at hand is the issur of following in the ways of the goyim (chukas akum) and darchei emori. As I said before there are prominent halachic authorities which include things that the goyim do for no purpose at all (and not just things which are done lsheim avodah zarah). The question is whether these are considered to be chumras or included in the actual issur of chukas akum. Additionally if one were to do such things for different purposes than the goyim it may not fall under the category of chukas akum. Either way this is a valid halachic and hashkafic question about which one should inquire with their local posek/rav.