For most of these this is kind of right on paper but you gotta consider actual game scenarios: Making skirms costs quite some food which sets you back on your eco. For example defending in feudal with a lot of skirms can lead to worse castle age times compared to the archer player. Being 1 min behind can already mean all your skirms die to xbows. Also it’s super dangerous to push out with only skirms because only 2 scouts can rekt them. Knights I wouldn’t call a counter because it depends on numbers and upgrades. In early castle age xbows are usually better than knights. You mass them in feudal upgrade in castle while the knights player needs time while also having a harder time to add tcs (xbows are so cheap that you often can instantly add 2 tcs without stopping production). If the xbows numbers are good knights need +2 defensive upgrades which also is expensive. And then the xbow player can just add monks or pikes later on while making both knights and skirms requires a lot of farms. Eagles also need quite some upgrades before being able to engage. Lastly the scout line doesnt counter archers. That only applies if you have FU scouts in feudal or you can spam Hussars at some point in imp (unless you’re Turks or Indians then indeed light cav kind of counter xbow).
They can raid without breaking walls like behind woodlines or forward resources. They can break through palisades without vils being able to repair or wall behind. Also if they manage to get in you can lose 5 vils in one instant while knights either need large numbers or block paths to tcs to snipe many vils. Both units have their pros and cons when it comes to damaging eco, largely depends on stuff like base layout.