So I have two questions about the common for Isaak approach about spotting alien civilizations.
First there is some regions in our galaxy that are actual black spots in terms of visible light covered with the gas and dust remaining from the active star formation and more this regions are full of stellar objects that are visible only in infrared part of light specter. I acknowledge that the reason why we observe only infrared light is bounded to the property of interstellar dust to absorb all other length of spectrum and thus ionise and ions as known emit infrared. But in my view this all seems like expanding 2+ kardashev civilization which decided in order to maximize the energy efficiency to build up closer to the galactic core in such way achieving several purposes: higher star density means less delay in communication, abundant amount of raw matter means less waste disassembling stars, waste heat is used to create ionized gas which can be subsequently used either by fusion or by mass energy conversion through black hole in addition it is easier to direct ions than uncharged particles and charged heated particles would not voluntarily collapse into new star. I don't pretend every dust cloud is alien occupied but what are arguments for highly developed civilization is not colonizing some centrale part of our galaxy if it looks like some classic description for space region under the control of K2. So my point is that there is no absence of space which matches the criteria proposed in dyson dilemma and thus the Fermi paradox doesn't exist. As said above is quite obvious there should be some obvious flaw otherwise Isak wouldn't be so in love with dyson dilemma. So I ask you to point out why central part of our galaxy doesn't match the place occupied by some advanced civilization.
Second why even bother building more than one dyson swarm rather than switch to black holes as fast as possible. And assuming that faster you convert maximum mass into black hole more total energy output you get wouldn't it be more rational to search for such type of events in past rather than for dyson swarns. So whats are argument not to sail the whole home star system in direction of nearest black hole and grab it power to move around the galaxy shrinking apart stars and utilizing their remnants even to feed the initial black hole or creating new one or not if you are afraid of civilization divergence and at some point reassembling the whole galaxy into quasar in order to reach other galaxies and repeat everything at bigger scale. I assure that first quasars are so ancient that there is little chances of them to be artificial but it doesn't matter that this is the fastest possible engine and intelligent life wouldn't use it if possible for expansion.