You have a point, but there are an awful lot of reports of troubles with the AP and FSD.
The vast, vast, vast majority being user error by folks too lazy to read the manual though.
Y
Also, I could be wrong, but did Tesla have another mean of control acceptable by the government ?
The government has nothing to do with it- there's no regulation of L2 systems at all.
(well, I suppose it has to do with companies wanting to AVOID the government deciding they need to regulate it... but there's no specific requirements for any particular system as laws stand today).
The steering wheel system was the cheapest/easiest one available in 2014 when AP1 launched, and they've doggedly stuck with it ever since.
In part because Tesla keeps (so far wrongly) thinking they're just a year or two away from "real" FSD, where you no longer
need a driver- so why bother dumping $ into checking their awareness when the car can drive itself?
The 3/Y does have an in-cabin camera, but it's terribly ill-suited for driver awareness (wrong type, in the wrong position) and doesn't even exist in the S/X models.... the stated purpose of the 3/Y camera is... monitoring the passengers for doing damage to the vehicle when operated as an autonomous robotaxi... (see again Tesla keeps making design decisions in their cars as if they have already solved FSD)