The fact Dromon does not require chemistry alone is reason enough for a nerf. That in itself is a massive power spike. They are cheaper than Cannon Galleons, and don’t need an Elite upgrade; saving a massive amount of resources, 525 wood, and 500 gold to be exact. We have people legitimately arguing that they are being nerfed too much.
So what if it does very little damage to Teutonic Knights? I heard something like 5 per volley. When you have like 5 Dromons, that won’t matter very much anyway. Dromons are meant to be anti-building units, not Siege Onagers on water. At least toning them down to something like a castle age Mangonel would make them more balanced. Unlike a Mangonel it is very tanky when compared to it, and has a lot more HP and moves much faster, so that’s fair.
Even with this a nerf, having like 5 Dromons in a lake on a choke pointy map like black forest is still going to be formidable to defeat. Those Dromons will kill lots of enemy units even with their damage toned down.