Addicted to lugs
You just can't beat the style of a classic lugged steel frame. Steel last forever and it's always worth fixing it up again, finding vintage components in good shape is getting harder but they're still out there. I've got a couple vintage steel bikes and I love them all. A 70s nishiki has been my daily driver for over 10 years now and I recently got an 80s univega sportour as commuter while I fix up my nishiki (again). Next project is an as yet unidentified bright yellow beast with amazing lug work. I think most of the improvements in road biking and recent decades have been in components, and frame materials, but actual frame design for road bikes hasn't an improved much.