I think native TPs are already useful, but I think many native units and technologies need to be specifically reworked. Catalog of proposals on minor factions/civilizations (AOE-3 BASIC + TWC + TAD)
I see that the relaes houses have very similar elements to what has been proposed here:
Passive bonuses or abilities:
Some royal house passive abilities actually spawn units over time. The longer you wait, the more units accumulate until you press the button. (Could say it’s like a dojo)
I think even with the current flow of experience that tps provide, a slight additional passive bonus would be nice.
For example:
- Jesuit Alliance: Gunpowder units are created 5% faster.
- Alliance with Caribs: Fishing boats with a little more speed and +5% in fishing collection.
- Alliance with Navajos: Cattle 5% cheaper and +10% in the rate of fattening.
- Etc.
Note: (Royal houses will be the exception as it has such ability)