Cylindrical mirrors, on the other hand, are easier to produce (can use a reciprocating polishing tool with a 2D parabolic profile). However, they can't produce a point focus as per this: https://physics.stackexchange.com/questions/29853/are-cylindrical-mirror-telescopes-possible
Isn't image processing at a level of advancement now where we can place a linear array of sensors at the focal area of a cylindrical reflector and correct the optical aberrations in software? Can't we launch an entire array of such reflectors stacked on top of each other (similar to Starlink) and use a much simpler unfurling process in space to create larger, cheaper space telescopes?