Jester David
Hero
Multiple attacks always cause screwing with the shortness of time of a D&D round. That's something I would have liked to see changed: 6 seconds is just too short for all that is expected to happen in a round all at once. Even if each turn was 6 seconds things get tight.But, with a free hand, a high level fighter can do it nearly once per second? (Four attacks + bonus action with the feat.)
That said, it's improbable but less implausible. And I'm willing to accept that small amount of implausibility as something a skilled crossbow wielder - one of the best in the world - can accomplish. Especially if they have a mechanical winch allowing them to speed cocking. It doesn't take me out of the game as much as someone grabbing a crossbow string with a couple fingers while holding onto another crossbow and cocking.
The double hand loading causes problems on multiple levels. First, you stop to think how it would even happen. And that's the problem. You have to stop and picture it in your head, which is time you're not immersed in the game and story. Then you actually think about how it would work and the requirements and it seems even less likely.
I've tried lifting my son with just two fingers (one of his hands on my index, and one on my middle) and it's less a question of muscle (and it does take a lot) and more a question of what the joints can handle. And that's taking less force than a crossbow drawstring would take and said force is spread out over my entire finger. A good comparison would be picking up a really heavy load of groceries with one hand (again, four bags of potatoes) and lifting. That freakin' hurts.
My issue with so much of the dual wielding crossbow fans is frankly the laziness. Most aren't coming up with good suggestions for how it works, neat descriptions for how to describe it in game. It's just "this is what the rules say" or "the game is about playing heroes who can do impossible things" or "this is about my fun and desire to play a gunslinger-type" or "it's just as unrealistic as X". None of those do anything to convince me.
Really, it doesn't take much to justify the situation. Cords attacking the bows to the wrists is fine. That's all it takes. It looks a little silly, but it solves the issue. But, most of the time, that minimal effort isn't taken.
Or how about hooks on the sides of the boots? The crossbow wielder spins the bows around and grabs them by the front, crouches down, and slides the strings into the hooks. They hold on and straighten, drawing the strings at the same time (while using the stronger leg muscles). Then grab the bows again and slide a bolt from holsters in the legs with a couple fingers and let it fall into place. That catches the imagination and *seems* reasonable, while also keeping people in the game. It's less distracting while also being badass.
But being creative is just harder than arguing or trying for a compromise...