i respect as a fan of vintage speakers that you feel that way. i just don't think it's so simple as that.Exotic Cabinet materials are a gimmick. Some of the worst speaker systems I’ve heard use the most exotic and expensive materials.
my speakers cabinets are built from hundreds of layers of Baltic Birch. owned 2 different sets like that for that last 20 years. love them. my Kharma Exquisite 1D's from 2001 were built from large slabs of resin, glued together, with wood cometic shoulders. sounded very natural.
i've heard systems i enjoyed with speakers built from all sorts of materials. and plenty of systems built with exotic material i did not like. or wood cabinet speakers where i did not care for the system.
i would not agree that universally exotic material speaker cabinets are a gimmick. but clearly some maybe are that way.
i do overall prefer ceramic mid range drivers to paper mid range drivers. and generally exotic material drivers can be less natural than ceramic, or paper to my ears. likely driver materials are more germane to the sound than the cabinet material.