There was a very good reason for Tesla to have built battery swapping and it had to do with the way that the Air Resources Board (aka California ARB (or CARB as those of you outside of my state know them)) provided credits for car manufacturers building "alternative" fuel vehicles.
At the time Tesla was demonstrating battery swap, car manufacturers got a larger credit for building vehicles which can be refueled to full in ten (I believe it was in ten) minutes or quicker (i.e. akin to a gasoline/petrol pump.). Therefore, battery swap provided Tesla with the most credits which it sold off to other manufacturers that will not make their alternative vehicle production numbers.
However, since then, the ARB has re-jiggered the credit system to de-emphasize this and to promote hydrogen.
So, battery swap is in limbo.