In my opinion if you freeze features on the Duet 2, you're going to lose those owner's loyalty to the brand... When I can't have the next killer feature that comes out, I'm not going to invest in a Duet3, but will be looking at other cheaper boards that support RRF, or most likely, will be jumping ship to the Klipper side!!
I think removing the exotic kinematics with an option to swap them back in for a manual compile, or even having a pre-compiled firmware for both, is a good option.
@joergs5 said in Duet 2 Hangprinter, 5-bar Scara, Polar, Rotary Delta kinematics:
Maybe someone can even find good solutions for those problems in the future with additional hardware.
Along the same line of thought as what joergs5 mentioned, another option is to take a hybrid Klipper approach and offload some of the functions to another controller or RPi, like input shaping, DWC, heater tuning, etc. Or even a full Klipper approach. That will provide plenty of space for additional features and extend the life of the Duet 2 and 3 for a long time. Not sure how feasible that would be, but it was just a thought.