I don't understand why you are bringing Cruise or Mercedes into this.
Because you're trying to compare disengagement rates of an L2 system that can be willfully disengaged by the driver for any given reason, to the rates of other AV companies.
It's really not, and being reductionist is not helpful.
You can define "disengagement" if you have to, in order to answer this simple question. I like the definition of "critical DE" on the FSD-tracker personally.
Here is it replicated: "Critical: Safety Issue (Avoid accident, taking red light/stop sign, wrong side of the road, unsafe action)"
I think "unsafe action" is far too broad and subjective to be a useful part of the definition. So I'll consider the other pieces:
Avoid (at-fault) accident: 0 disengagements.
"Taking" red light/stop sign: 0 disengagements.
Wrong side of the road: 0 disengagements.
I think your perception of how FSD Beta drives have been very heavily biased by the media sources you consume. For your reference, here are the top reasons I disengage FSD Beta:
1. Other drivers around me are acting aggressively, so waiting a few extra seconds at a turn, or hesitating/waffling on a lane change could cause road-rage or cause them to hit me (not at fault)
2. FSD Beta has entered a wrong turning lane. I could let it continue down that lane and either try to merge back or take the turn and reroute, but it would be inconvenient for me.
3. FSD Beta is being too cautious for my preference e.g. slowing when it doesn't need to, sitting behind another vehicle that's turning.
4. FSD Beta hasn't followed a particular local legal requirement, like not stopping for a pedestrian even though they're on the other side of the road, not obeying "No right on red" signs, not obeying "stop here on red" lines.
None of those reasons meet the "critical" definition above, imo.