Can you get me started on using LinuxCNC on a non-traditional kinematic mechanis

Sorry... another newb question.

I have written and understand the need for a reverse transformation that converts a desired X,Y location to joint rotations (I have a simple 2-axis system).

We are running in open loop so there is no feedback.

Is there a reason LinuxCNC needs the "forward transformation" (which if I understand correctly, would convert a known joint rotation to LinuxCNC to a specific X,Y location. in an open loop system, what purpose does having both a forward and reverse transformation in your kinematics file do?

I think there is actually a way to run linuxcnc using only forward or inverse kinematics using the 'kinstype=' parameter but I have not experimented with that at all:

See 'trivkins - generalized trivial kinematics' section:
linuxcnc.org/docs/stable/html/man/man9/kins.9.html

I'm not even sure if this would have any meaning in a non-trivial kinematic.