I don't have time to reply to this with the level of detail required, but I'll just say that you underestimate the level of tech needed to deploy a mirror this

I don't have time to reply to this with the level of detail required, but I'll just say that you underestimate the level of tech needed to deploy a mirror this good, and you overestimate how much we understand the instrument design issues. That is, we don't know what to build. The trade studies are highly complex (how big the aperture is, how long the mission is, how much propellant is needed to slew the spacecraft, what the yield will be in terms of number of spectral characterizations, whether you need an external star shade). The star shade, if needed, would be a separate spacecraft. General comparisons to "how fast technology moves in the valley" are not specific enough to benchmark what's needed for this rather unique mission.