Starsiege Tribes compared with MechWarrior / BattleTech Clans

This thread is asking about lore/story elements, not the games themselves.

I understand the history of Dynamix and the original MW game, and that amusingly there's all sorts of franchises that stand similar to one another whether because of influence or past IP shenanigans. (See the history of Blizzard originally slated to adapt Games Workshop's games and then making their own series…)

But out of the similarities between Metaltech and BattleTech, what the deal with the similarities between tribes and clans? It's kinda amusing that both settings end up in a far future galactic diasporic situation where there are warring bands of neofeudal warriors. Is it because this is the most effective way to have conflicts where you have lots of different sides to choose from? I guess it's more interesting than CyberStorm 2's interchangeable faceless corporations.

I suppose one alternative would be to do what Warhammer 40,000 did and have different knightly orders in battle armor to choose from, but it lacks the free-for-all of tribal/clan warfare.