That’s a very good point, although I’m not sure it’s an Achilles heel to anyone but WIS. I’m sure handbags and advisories etc. increase Cartier brand recognition and profits, far beyond some watch snobs being turned off them as a serious proposition. MontBlanc may have another issue in that they appear to be trying to penetrate the serious watch market, after being seen as a pen and accessories brand by most.
It's just a matter of time...