Don’t want to belittle the achievement but they launched it as in „had it launched by the commercial launch provider SpaceX“, not on a self-developed rocket as it sounds like on the first read.
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An organization that can produce Ariane 6 should be able to produce a Falcon 9 clone with similar effort. The real problem is overcoming the of the old, slow, expensive way of doing things.
Arianespace is so thoroughly broken that they genuinely believed that reusability, if they could even accomplish it, would be bad for their business because it would reduce the number of rockets they build. Bonkers.