Exhibitors at shows may be more concerned about someone dropping a record weight on the turntable than trying to get the absolute best performance out of a compromised room setting. Electronics shows are not where published reviews are conducted.
An expensive cartridge could easily get damaged or the beautiful finish on a plinth or tonearm could end up with a dent or scratch. The nuanced sonic gains of a weight or clamp may not be worth the risk. Unless a turntable designer/ manufacturer (or similarly knowledgable vinylphile) speaks up, we won't know for sure.
Just sayin'...
An expensive cartridge could easily get damaged or the beautiful finish on a plinth or tonearm could end up with a dent or scratch. The nuanced sonic gains of a weight or clamp may not be worth the risk. Unless a turntable designer/ manufacturer (or similarly knowledgable vinylphile) speaks up, we won't know for sure.
Just sayin'...