Maybe ruined is the wrong word.
I've just built some wheels for a late 70's Brit bike of mine. Switched from 27" to 700c with some polished alloy Velo Orange PBP rims, 32 db stainless spokes and 700x20c tan-wall tyres.
Except it doesn't look 'right' any more. The diameter is noticeably smaller, the wheels look a bit short of spokes and the tyres are too skinny. The bike has lost something. The battered Brooks saddle and narrow drop bars just look out of era.
I thought I wanted to create the ultra skinny look with older looking tan-wall tyres, but I've ended up with an Anglia on 175/50/13's and 7" wide Minilights. I guess you have to be in that scene to know what I mean, but I think I've found where modern doesn't suit retro.
Damn, and I've just re-spaced and re-dished the old wheels for her Mixte