@Brute 23, do you mean the bottom access doors? I kind of thought that might be a negative, although because of the larger size (longer", maybe the would need to split that door. If you only open one, (assume the rear... is that front one then in the way and in a place where you could get your arm whacked up against it by a kicker? These bottom panels are made to swing out, hinged on the ends. Will they strike the ground, if you don't have the chute "squeezed" to tilt the side panel inward? Looks to me like that panel is slanted out on top pretty good... And then if you open it, they're sticking out there in your way potentially, where with the old style, you just removed the whole thing and set it out of the way... They went to a plastic panel in that bottom door... supposedly makes it quieter... because of the frame required to support that plastic, I wouldn't think that it could be any lighter weight.
My concern with putting them in the chute first, and then catching them in the headgate is that some won't enter the chute as readily if they don't see enough daylight out front to escape... so THAT aspect might potentially slow down the flow a bit. And then beyond that, making it a "two step process" like that would also slow down the flow through a little bit. Not a "big" issue, but still, "an" issue to consider at least. That said, operating slow and quiet is usually faster than fast and noisy! SLOW is FAST! Cattle hitting that hard stop at a run can be pretty noisy, and cause a ruckus... which also impacts all those that are yet to come through... Clanging and banging, and chutes moving around from those kind of hard impacts have their own negatives to the operation, for sure!