So, the strongest crossbow in the game, the mettenheim arbalest gets easily beaten by bows like hawkstorm bow, hornbow or ebon bow if it doesn't one shot the enemy. With full +4 power draw bonus and decent arrows, the bows can 2 shot pretty much all but the most heavily armored enemies.

The problem is that the crossbow won't one shot enemies with 40 - 50 body armor and 70 - 80 health and has pretty much half the rate of fire of the bows, if not even worse, and the bows can be used on horseback. Then when you start to consider hit probability, it gets even worse.

If the enemies are far away and your troops hit 1/5 shots, the bows will win even if they have to hit an enemy 3 times and the crossbow only 2 times thanks to the superb rate of fire.

The same thing goes for the arquebus. It has the same problem and gets completely outclassed.
Then, when you start to compare them to the top tier noldor bow, it's just sad.

If you developer(s) intended it to be this way I respect that. It's your mod and you can do whatever you want.

But in my opinion, the crossbows and the arquebus deserves a buff to damage or rate of fire to make them at least a little bit competitive.