The latest versions of the Instant Legolas are extremely practical and would have utterly changed warfare.
It’s now a 7-shot pump-action with an ergonomic handle that decreases the load on the fingers, has a trigger release and a perfectly consistent draw. All of these features mean that an equally trained archer will be able to draw a slightly heavier bow and shoot more accurately because consistency is key to accuracy.
People have said that the high fire rate isn’t much of an advantage for a heavy draw weight because you tire the archer. There’s 3 answers to this.
First, Joerg’s latest model has a tab at the front that lets the archer use two fingers on their left hand to assist in holding the bow at full draw. This reduces fatigue because the effort of holding the draw is better distributed during aiming.
Second, I think of this more as an anti-cavalry and anti-charge feature. There’s nothing stopping archers from loosing one or two shots per volley and then reloading so that they stay fresh. Then if enemy cavalry charges, they can shoot all their arrows in a massive volley, likely breaking the charge.
Third, it’s an ideal ambush weapon that would have shifted the emphasis of warfare to small unit tactics and skirmishing. Historically, ambushes usually entailed an initial volley to soften up the opponent and then a charge to press the attack, because the casualties inflicted by one volley wouldn’t be enough to make the ambush worth it. But 7 shots each is probably worth it without the charge. A small band of elite skirmishers could take chunks out of the enemy force, and even if the men picked up shields quickly they might still be able to wound or kill the horses and prevent enemy cavalry from ever reaching the battlefield.
These are all significant advantages with very little downside. I don’t think it’s reasonable to think that this wouldn’t have changed things.