True on almost all counts; an intelligent designer would not have cared how difficult to make or use infrared vision was, because he would simply design the creature to do so - much like we have made our own thermographic imagers and like some creatures do. similarly, evolution won't care that it's only detected by a few random rare chemicals - if there was advantage to it, the random mutations that have allowed it in some species would have caused them to outcompete and thrive more than they have
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I am not getting why you seem to think that an intelligent designer would find it correct to design in arbitrarily complex systems in the interests of marginal competitive advantages. Any system that the IDer designed in would need to be reproducible, compatible with the entire system, robust, etcetera. Any system (like thermo-graphic imaging) has to be programed into the genetic code, with the attendant increase in failure rates, requires, as you pointed out, a cool detector, etcetera and mandates changes in every linked system in the product. We are better designers in some respects at least partly because we are not constrained by full system design, we are trying to make a thermographic imaging system, it need not reproduce, need not last the full life of the owner, need not tolerate abuse and varying conditions, need not self-repair, need not self-power, etcetera
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