MTB shoes on a road bike make you look like a pauper.
I’ve just replaced the M520’s on my commuter with some Red M646’s I had left over from pulling my DH bike apart, just for the sake of it TBH…
You are right, I reckon they make the bike look even cheaper and tattier, but also like the rider might be some sort of scary weirdo…
And of course “those in the know” will recognise a classic pair of DH pedals fitted to a cheap Drop-bared, fixie, with mudguards and a Bar bag, and hopefully be a bit flummoxed as to what manner of dickhead might combine those mismatched parts…