I don't think it's a massive assumption that all of these companies have autonomous systems capable of attempting complex maneuvers when vehicles were attempting them back in 2016, the biggest distinction here is that Tesla allows their consumer vehicles to attempt them while calling the systems Level 2 and making the driver responsible. The other companies are generally far more conservative in their approach and lean more towards offering simpler systems with narrower functions aiming for higher SAE levels.
Mercedes is partnered with NVIDIA and uses their Drive system, you can find heavily edited and curated videos of it doing FSD Beta-like stuff
Now I'm not quite suggesting NVIDIA's / Mercedes' system would do as well in these maneuvers, although who knows what point each system is at, but I have no doubt all of them are capable of attempting similar stuff. And I think you'd find capabilities across the systems is much closer than it appears in the public realm.
I personally don't care much about what a vehicle will attempt if I need to supervise it, but I'll give money to whoever gets Level 3+ autonomy and sells it at a price that makes sense for the value it'll add by allowing me to focus on other stuff as it drives in its defined ODD. If Tesla puts out a Level 3+ highway system that will do my 10hr highway drives while I work or surf the web or whatever, I'm there. If Mercedes does it, I'm there.