lichmaster
Hero
It's an interesting idea, but I'm not sure it would fit well in the current design space.Hmm...various cultures in real life have their own combat traditions, what if some of the cultures in A5e had a culturally specific combat tradition of their own? Shadow Elf Culture, for instance, could have a stealthy combat tradition that relies on stealth, hit-and-run tactics and darkness.
Cultures give a few features that can be used by any character regardless of class (although some features have better synergy with some classes than others). Combat traditions only work for martial classes, so their benefits would be totally useless for pure spellcasters.
Besides, an entire combat tradition is worth several pages of material (as you need to provide at least 5 degrees of maneouvers), while cultures are normally between half a page to a page top.