I agree, I've never had my Dior purchases handled by SAs with white gloves on, I think only once did that happen, but it was only because she seemed to be wearing the glove on one hand anyway and didn't take it off, possibly because of an allergy or something? Anyway, I thought it was strange that time I was served by an SA with gloves. I've been in Hong Kong most of my life prior to coming to the UK and I've also been to the boutiques in Milan Via Montenapoleone and the one in Rome opposite La Spagna, and never saw any of the SAs at these boutiques in either country wearing gloves.
I think it also goes to show that while Dior keeps their goods at a high level of quality, it is also sturdy enough that it won't get affected too much by minimal handling from the SAs to ruin the leather, which might be why they're used at other designer boutiques?