Hey GregZo,
The Elite/Masso G3 Series don’t rely on stall homing, but have limit sensors (infrared in this case), and if you have limit sensors, you get a good positioning repeatability (when rehoming), even after powerdown.
However limit sensors are supported by the buildbotics-derived Onefinity controller of the Standard Series as well, you can retrofit inductive proximity sensors to the Onefinity Standard Series, people have already done that (usually with 3D-printed parts to hold the sensors) and it works absolutely reliably then.
The reason why the zeroed values are not made available on the Buildbotics/Onefinity Controller after an estop or a reboot, does not seem clear to me, as all zeroing values are recorded in the bbctrl log file and can be found there after a reboot. And as the bbctrl logfile is subject to logfile rotation, all these values remain there for a very long time. As for now, they are not directly made available to the user.