Tesla is still working on the FUNDATIONAL model of FSD. Localization is a difficult problem without HD maps and Lidar. However they are getting pretty close at solving localization..the extremely difficult part all other companies skipped. NN end to end deals with the final stage of their foundational model.Given it's been over 3 years since FSD began recognizing and responding to stop signs, and it still does not recognize 'stop sign coming up soon' ones, I'm not sure your use of "just" reflects the difficulty involved. Likewise about 3 years for reading speed limits, but still does not read condition ones (ie ones with time or date restrictions).
There are something like 100ish different federally standardized traffic control and warning signs, to my knowledge FSD does not recognize any of them other than STOP, SPEED LIMIT (but not restricted) and YIELD (and it's been hit and miss on reacting properly to those honestly with it sometimes treating it like a stop even without oncoming traffic and other times not slowing down for it at all- neither being correct reaction to a yield sign).
And another quick reminder this forum exists where this discussion really belongs:
AI, Autopilot, & Autonomous/FSD
Discussion about AI, Tesla Bot, Tesla Autopilot (AP), the promise of Full Self Driving (FSD), as well as other Autonomous Vehicles.teslamotorsclub.com
I expect Tesla to start adding more signs/ability to read signs/roads names after they are satisfied with localization. In the mean time, the car can do a lot of the driving by itself just with the few limited signs Tesla added to system plus map data.