Knights are just one-tenth of the army. Their main purpose is field battles, face to face. What use is guerrilla tactics for them if they won't even go into the forest? Let other types of troops handle that. Lighter, more maneuverable, and not so narrowly specialized.
There is a breed of horses called destriers. 800-1000 kg. They don't jump. They get tired quickly. They are only used in battle, just like combat armor.
The horse is tall, so an infantryman can't reach it with a sword - and even if they could, a wall of such horses would easily break any formation not equipped with polearms.
"The main problem with the breed was its huge mass, which made it impossible to jump (so ditches, swamps, and similar obstacles were difficult to overcome), and its rapid fatigue, which meant that the cavalry suffered unjustified losses from overhead fire from bows and from artillery fire[1]." - wiki
It simply won't reach the archers, and it will be completely useless against pikemen.
And of course, it's easy to shoot at it from a crossbow.
The myth about the impossibility of getting up originated from tournament armor, which weighed about 70 kilograms.
Even plate armor weighs half as much and is much more comfortable. And it appeared only at the end of the era of knights. Before that, chainmail, lamellar, and scale armor were used, which were even lighter and restricted movement less. Moreover, the head and torso were protected first. Most knights did not have greaves and gauntlets, at most chainmail shirts and trousers over leather.
In fact, the typical image of a classic elf in fantasy is based on the English archer of the 14th-15th centuries. It's a good thing that elves don't exist; they could have destroyed humanity with their bows.
Lol, you missed the mark and immediately started making excuses. Soft hands.
Except the ones we've made