It's a bad argument.
You have to ignore the statements from the company or even the ambitions of it's CEO that it will become a Level 4 or 5 system.
There are design limitations to FSD currently that go behind a human monitoring and frequently correcting the system. Even if there were 0 interventions, it's still a level 2 system if the human is required to supervise. FSD Beta is not even a perfected Level 2 system, which is the craziest when people say it's already L3 or L4. IF FSDB was currently a L4 system with a safety driver, the system would be able to do full DDT and fallback DDT within it's limited Operational Design Domain. The safety driver is there for liability reasons and validation of the system. The car, with a safety driver, is still designed to take complete control, but that's not the case with FSDB. How FSDB is designed, the driver is responsible for some of the OEDR or Object and Event Detection and Response or monitoring for accidents/issues/need for disengagement. A L3 system handles all DDT, monitors OEDR, but does not have a fallback DDT, that's where it asks you to take over.
FSDB is not designed as a L4 system with a safety driver...again, that's just an odd reach/leap mostly for the investor crowd to hope that Tesla is closer than it is.
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