I will break down my observations so far:
1. The "cool kids" won't be caught dead in a GM and Ford is real. The cool kids used to drive BMW and are now switching to Tesla. Not just cool kids but the cool mom and dad too. They are likely not going to be qualified for the 7500 credit anyways and would still buy the Tesla to keep up with the jones.
2. Tesla's non legacy cost advantage: another non domestic company can do that too. Toyota, Mercedes, VW, Honda all can do without the union $70/hr cost because they had not been kicking the can down the hall for decades, but they don't have the Tesla's sales, so I say this is not the reason to Tesla's success or failure. It is possible GM / Ford will be screwed even with the right products because of it, but that's the business decision in the past not the EV's fault.
3. Interest rate increasing: yes this is a huge problem for anyone doing advanced R&D instead of keep selling old stuff. Tesla will get impacted the most but the legacy auto companies are also fully in debt to the gill, so that's not the biggest problem. Consider the fact that most domestic relies on high priced trucks for the income this will actually hurt them just as bad as a Tesla.
4. Cool products: again, beauty is in the eye of beholders. Some people like big pickup, some people like the sleek EV, they don't cross shop each other. Nothing prevent one company from making the other's stuff if they want to.
5. R&D advantage: Tesla is way ahead because they dump a lot of money into new stuff instead of keeping legacy stuff. It can be a double edge sword though. This is IMO why a lot of their products screw up come from because they are updating too fast and never have the chance to test things out before selling them. This will likely keep up till the whole EV market is mature and everyone is done licensing (or copying) from each other.
6. Supercharger network: sure it used to be a huge advantage, but now since everyone will license to use supercharger, it will eventually be a leveled playing field.
7. Stock price: This IMO is the biggest differentiator. Tesla brand itself as a tech company getting tech money in stock sales, they can borrow money like no tomorrow, sell stock like no tomorrow, hire expensive people like no tomorrow to work like no tomorrow. This is how growth happens and Ford / Toyota etc will never get there with their legacy business. The investors are different and won't bet on their stocks like Tesla. The only way around it is they seed a tech startup like Rivian and keep a controlling share but not privatize it, then gradually let it mature into place.
8. Scale: Tesla is still small compare to other companies in volume. Sure it has the best selling model, but their overall volume is still small in comparison. Eventually if it wants to grow it will have to compete in the lower margin market against Prius, F150, Civic, etc. Right now it is competing with BMW and it is winning, but eventually it has to go downmarket to keep growing.