There's also the whole concept of feudalism to throw into the mix. Longbows were cheap so you could require your peasantry to own and practice them - or at leas

There's also the whole concept of feudalism to throw into the mix. Longbows were cheap so you could require your peasantry to own and practice them - or at least for a community to supply X archers per Y population. Knights are significantly more expensive, and again require years of practice. The principle of feudalism was landholding being tied to military service - you hold the land from your feudal lord and in return this supports your ability to provide military arms. Take away the requirement for you to provide expensive armour and destriers (the war horses knights rode) and you remove the need for you to hold land, which undermines the political settlement of the Kingdom.