ifaesfu wrote:Isn't there x3 movement yet?
AFAIK: river x3 movement is disabled by default in the ruleset, and substituted with the trireme thing.
IMHO, both should coexist altogether.
However, it doesn't make sense that a potentially tactical and strategical feature such as trireme river navigation should abruptly end with the advent of more modern units.
The problem may be addressed in 2 way:
1- triremes will no longer get obsolete. However I believe that this neceserily mean that they can't be updated.
2- (preferrable) All marine units of the same obsolete/update line (triremes, caravels, galeons, and transports, i.e. all mainly transport marine units) shuold have the same ability to travel throu rivers. Additionaly: they shouldn't get any terrain defense bonus, and they also should be given a defense penalty when attacked in a river tile.
Consider than with (2), even without the defense penalty, once exhausted the military and exploration ability of the trireme, river navigation will have less and less strategical importance, and they will just used for fast transport and limited military tactical operations.