FSD has the potential to be a game changer. But I remember seeing that not all Tesla models can use it. If Tesla models are already limited by it, I wonder if it can be easily added to other manufacturer's cars.
They are limited, mostly by country/market. There are things to navigate. Also, the software isnt very good in many countries since there hasnt been massive penetration. We also have to take into account left versus right side steering wheels. This all have to be handled.
The hardware limitation is only to a few very early models. All from, I believe 2016 (but I might be wrong) are hardware compatible.