The research I've done on it disagrees with your claims.
There were valid reasons why in 2008 when Tesla was developing the Model S (this is before the Roadster was even in production)* and all in on a nationwide charging infrastructure, that the CCS specs at the time, was unacceptable. Remember too that the Model S was originally planned to hit production in 2010 but Henrik Fisker threw a wrench in that.
Suffice to say, the first Supercharger was INSTALLED AND FUNCTIONAL before the CCS standard was adopted. This was in 9/2012. This didn't happen overnight.
*p69, Power Play; Tesla, Elon Musk, and the Bet of the Century. Tim Higgins
I also can't see Tesla ever acquiescing to an inferior "standard" if they don't feel it's critical for their mission. The NACS is a good example of that.
There's also the issue of charge rate. The initial CCS specification was limited to 50kW. The 2012 Model S was already capable of 90 kW. As above, for Tesla to take a step backwards seems uncharacteristic to their DNA.
Tesla went it alone to develop the first Tesla EV charging plug, but now there is a push for common standard. So, which will it be when the Model 3 is exported?
thedriven.io
"In this article I will contend that this is not really due to Tesla ‘wanting’ a separate plug standard to the rest of the world – more it is because they needed them right then, and could not delay waiting for the rest of the world’s EV manufacturers to catch up. "
"Following the Tesla plug design, in 2010 the first international EV charging standards for AC and DC were developed. "
"Later EV manufacturers also initially adopted these plugs as it suited their needs and they were not particularly inclined to take up Tesla’s offer to share their plug design and chargers. (Partly because Tesla stipulated that to do so, they had to contribute to the evolving Supercharger network.
Given the skepticism that the major manufacturers had – and to some degree still have – for the longevity of Tesla as an auto manufacturer, it is hardly surprising that they declined the offer!)"
Actually, it's a fact that some ignore.
Here's a video sometime around the release of the Model S of an interview of a Tesla engineer discussing exactly what
@Tronguy stated. The good stuff starts around 1:40.