It does goat, it does...

1 level of experience ads 2 points to accuracy, 2 points to reloading speed, 1 point to all the melee stats (exception is charge) and 1 point to morale. It's pretty cheap also...

You dont really notice it because ofcourse the scaling and handling of stats is different since RTW.

You could test it by fully upgrading one unit of line inf and using one blanco and just let them shoot each other. You should notice differences in reloading for example.

Greets...