All these flaws you talk about on other cars are not accidents. Everyone is running up against the same fundamental tradeoffs, and only one company has done the insane optimization of everything to get to the other side. It's not a matter of just deciding to do so. The nio example you mention for instance, Tesla famously was initially planning to use the lotus Elise body for the roadster, but ultimately had to redesign essentially every part to get to production, since the weight changes invalidated all the assumptions of the original.
Yes, they're not the best at every single thing. But producing the safest car ever for a newcomer is pretty nuts. Producing the most efficient electric car ever is pretty nuts. Producing the best OTA story ever is nuts. Producing the most advanced driver assist feature is pretty nuts. Doing all these things together requires explanation. It can't just be "oh, the others just made bad choices".