@CorruptUser We don't see evidence of Dyson Spheres or stellar engines cause until very recently we've been limited to using electromagnetic radiation to "see" what's out there. Considering a Dyson Sphere would block all radiation coming from a star and a stellar engine probably wouldn't emit enough to be detected by even the best telescopes, the answer to why we don't see evidence of such things (if they exist) is that we lack the technology. Heck, we can't even detect 90% of the objects orbiting our own star....
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@CorruptUser We don't see evidence of Dyson Spheres or stellar engines cause until very recently we've been limited to using electromagnetic radiation to "see" what's out there. Considering a Dyson Sphere would block all radiation coming from a star and a stellar engine probably wouldn't emit enough to be detected by even the best telescopes, the answer to why we don't see evidence of such things (if they exist) is that we lack the technology. Heck, we can't even detect 90% of the objects orbiting our own star....