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> would it be reasonable to assume that Webb will get copied in a similar way for spy satellites?

Unlikely. You have the origin mixed up. The spy satellites came first, and then Hubble.

Yes, the spy satellites were first by a long shot. The KH-11 (2.4m mirror, CCD focal plane) was first launched in 1976. Hubble (2.4m mirror, CCD focal plane) was launched in 1990.

The shared mirror size is not a coincidence: https://en.wikipedia.org/wiki/KH-11_KENNEN#Size_and_mass

The two also share a multi-billion dollar budget.

The mirror size is largely limited by the size of the vehicle launching the satellite into space, if I recall correctly.

Which in turn is based on the size of a equine derriere, as the story goes.

https://www.precisioncontent.com/blog/on-rocket-ships-and-ho...

Next comes the space telescopes that are based on the KH-11 spy satellites: https://en.wikipedia.org/wiki/2012_National_Reconnaissance_O...

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