If past Early Access in which I participated is a gage, when I tested traffic sign and signal recognition, it was about a month of testing/feedback/monitoring before a release to the "herd". Even after release there were several changes to the function. The timing was similar during Navigate on AP with route and auto lane change testing last year. I was concerned that Tesla's recognized "double lines" (no crossing legally), as well as considering the number of lanes needing to travers to exits (up to 6 on some roads here in ATL from HOV). With the testing and feedback, they got it right.
However, I think Tesla is "looking back" (correctly) to the original AP in 2016, when some drivers jumped the gun on FSD -- riding in the back seat, driving while watching movies (a fatal decision), trying to defeat the driver resistance on the steering wheel, putting their elderly mother behind the wheel to scare the hell out of her, etc. So as a result of these unanticipated behaviors it is now THOUGHTFUL AND SAFE. The complexity of surface road driving is so complex, Tesla has to defend and protect against the stupid and inattentive.
Since FSD at the street level is much more complex it will have to be vetted in software with many scenarios and driver protections. It most likely will, and should require serious testing even after the "very good and thoughtful drivers" are done and it moves to the Early Release Program for further testing by a larger population. If I were Tesla, I would be very cautious before trusting millions of diverse driving experiences and habits being unleashed on the public roads. I am willing to wait.
There is more at stake -- if this fails due to inattentive drivers or those jumping to level 5 autonomy, regulatory approval will be damaged for years.