Those two printers are also smaller and not as accurate at high speeds. The A1 Mini's slicer automatically places parts close to the Z axis in an attempt to reduce the issues and it uses input shaping, but given the printer can lift itself off the ground at default speeds that's not a perfect solution either.
There's a reason the larger and faster printers often use the CoreXY design instead.
Of course, there's always trade offs in (mechanical) design choices. But their static accuracy absolutely is that good, which is fascinating at that price point.