@Sineos is FAR from a layman
One thing to note 64k 3 byte samples per second isn’t going to happen over USB.
BUT slowing down a ADC reduces the noise making the post processing much easier.
One of Klipper’s main strengths is the host does all the processing keeping everything in sync. The MCU is basically just a router getting data to/from specific pins. In this case that’s unfortunate as the STM32 could down sample/smooth/error correct the data stream and avoid transmitting all the noise to the host. Mellow claims to be running Kayman filter algorithms before converting the output to 1 bit data. I’d love to be able to see their raw vs filtered data.
At the end of the day the ADS1220 running a 2kSPS is going to loose 3 to 4 bits to various DSP processes. The ADS 131M running at 2kSPS is only going to loose 1 or 2. This results in the touch point being resolved to, for example, ±1g instead of ±4g. What that works out in microns depends on how rigid the printer is.