You misunderstood me. This is not a replacement for tags, this is the only way to use one topic in several categories. If a topic equally belongs to several categories, then now it is impossible to do this, you can only select one category. Thus, you can create a new category based on the rules, using 2-10, etc. tags. Or add rules to the old category. Once again, tags are used as rules for linking topics to a category. Half of my topics need to be linked to several categories, but I can only link a topic to one category