Klipper 
And now try to print something tall and large. For flat items, sure, this will work, but as soon as you try to fill the build volume, the quality goes down really fast.
I think, being independent of the printed height, is the biggest advantage Core-XY has. Otherwise, just add a stronger motor and wider belts, and yes, the same speeds will be reached.
I wonder how the a1 mini manages it with only 1 upright. Id say it really comes down to rigidity, bed mounting and vertical supports. At a certain point, its not much different than an xy.
I’m not sure what that video is supposed to prove. Their printing what looks like a low-mass <10mm high objected. Ok? So what? What does that prove?
To me it looks just like any other marketing video where the circumstances of the video favor steering a conclusion of the buyer. I believe in technical parlance we call it “Smoke & Mirrors”. So in the words of that world famous Rock Star in Spinal Tap, Nigel Tufnel, “This goes to eleven”. 
A meaningful test would involve a side-by-side comparison between an X/Y Delta printhead printer and an X/Y bed motion printer. Both would print a 100mm tall benchy with greater than 50% infill. This test would highlight how well the bed motion printers handle the increasing mass of filament deposition compared to the static bed devices.
I don’t have a dog in this fight so I really don’t care one way or the other but it seems that there are some sectors of the 3D community who take this stuff way too seriously. This is supposed to be fun. If they were doing this for a living, I might understand that but how many people actually have a printer farm?
The one thing I found appealing about Bambu’s approach is that it simplifies the motion algorithm significantly. By keeping the bed movement in the Z-axis and the head movement in the X/Y axis, this approach reduces the complexity. In this design, the challenging movements in the X/Y axis are handled by a static printhead rather than a moving print bed. In contrast, when you have a moving bed, managing the motion becomes more complex as the filament material mass increases. This X/Y printhead approach avoids these challenges.
To me, all of this means that, based on my experience, simpler mechanical designs tend to have longer lifespans with less need for constant adjustments and maintenance compared to designs that rely on complex and “elegant” solutions. In my 40 years of working with engineers, both as one myself and now in a management role, I’ve learned the importance of keeping teams focused on the core objectives while still encouraging innovation.
Often, engineers love to solve problems, but in the tech world, there’s a tendency for someone to come up with a brilliant idea and then expect the sales team to find a problem that fits that “great idea.” It seems like something similar might be happening in the 3D printing community. People can become so attached to their preferred approach that they may not consider the bigger picture. Sometimes, this happens because they’ve heavily invested in a patented technology and have to promote it, but other times, it’s because they’ve boxed themselves into an intellectual corner and can’t backtrack without losing credibility.
nah. Just a video of a printer moving fast. Youre overthinking it. Just a fun video. Dont take stuff so seriously.