I am confident if someone posted a picture of a Mountain Goat deluxe with California Yuppie paint job, a full Mavic MtB groupset and a Turbo it I am confident it would be universally considered as cool (except by those going out of their way to be contrary, in order to appear more 'cool' themselves according to their own inverted logic). Or something.
indeed it would be, however i fear you are missing the point of my argument.
the bike you describe would be a very, very nice bike to look at, for it to be ridden hard by the guy who slaved over it putting it together & fine tuning it to perfection is cool. for someone to build it up, take a fancy posed studio photo then leave it sitting in a garage purely to say "i've got XYZ at home" is a sodding tragedy and pretty damn pointless. same bike, different context, different outcome.
a shonky, heavy-ish late 80's entry level 'thing' restored & built up to its original (slightly below par on the grand scheme of things) factory spec that is paraded around like its something special is uncool, regardless of how pretty the pictures of it are. the same bike, lovingly restored to recreate someones first 'proper' mtb & it being given a good old thrashing at any opportunity making the owner feel like he is 15 again makes it cool, even more so if they got opportunity to embarrass someone on a high spec'd modern (or retro) bike with their 'uncool' chunk of pig-iron!