So agreed. Another lingering Problem of the Archery-Line which inflates its inferiority (arguably much less of a problem now with defensive strikes but still exist imo.).
No need to reduce the power though imo. Tier 4 Units should pack a punch and acess to high-level metal weapons should improve your units heftily (given the absurd investment to get both Precision and MW.)
In the long term to truly balance archery acess to Iron for the whole line might be what whould get it on par (bronze for Archers, Iron as had for Longbows and Mithril for Marksmen. With bronze a requirement for Bowyers and perhaps Smelting or Iron Working for Precision)
It might seem a bit over the top for Ljos after the most recent changes and def. Strikes. But given what the Svarts can do its not that broken really...
That whould also be a good way imo to differentiate a bit more from the power of the Arquebus which otherwise might be a source of Problems if the Archery-Line is beefed up and surely doesn't need that boost given the overall benefits of the Unit + the techs leading up to it. (also doesn't make much sense from a flavor perspective...)
Btw. @ ZuP: Mithril Working and Mithril Acess are the same tech for a long time now.
I doubt the OP meant the tech Mithril Weapons. Morely the actual acess to the metal and thus the mithril weapons promotion.
Edit: Misread the OP, sorry. "Only" Mithril Working tech is required really not the Mithril Weapons tech so Zups correction hits the mark right on.
But its still ridiculously expensive in terms of beakers. And should be even more of a problem now with the later techs made more expensive...
(given that its really the only national unit to my knowledge with such a hidden requirement it really seems like a relic from Versions long past... Knights, Beastmasters and Shadows are hardly that much weaker than Marksmen. Let alone Druids and Archmages.)