A relic is a new instrument that’s a copy of an antique instrument. A new instrument is a new instrument. A reissue is a new instrument often modelled after a line that are now antiques. I see the appeal in all of those. Whilever pros are playing battered instruments (and even Buddy Holly’s Strat was battered), there’s a place for the conceit of a relic - to buy a guitar that you like the way it looks and plays, often a well-used one you saw someone on a stage or in a video playing. I like them shiny, but I still like my nitro guitars to develop a patina from use, and when the finish shrinks into the grain after a few years. Other people spend their time waxing them. It’s all personal taste rather than fashion, I think.