The other problem here is that it doesn't account for differences between industrial sectors. Different industrial sectors have different amounts of consolidation. This lends itself to higher valuations. Certainly European engineering as a sector is worth far more than luxury fashion. But engineering has more resistance to consolidation. Some of this even comes down to how the different sectors are differently regulated. Consolidation in many sectors will face more intense scrutiny than in others. Lastly, we have to account for how global a sector is able to become. Certain sectors like construction, in large struggle to sell their services in a global market this limiting their size. Fashion, like movies is exactly the kind business you would expect to attain a global reach.
I will agree on one point though. As an export, LV demonstrates a grossly uncraftsman-like aptitude. My wife rebuilds and repairs designer bags. Late LV is some of the cheapest and most shoddily made shit she works on. The older bags are great. But since the 90s, the bags have declined tremendously. The same is true of Gucci. I think this is pretty clearly the product of those two brands absolute explosion in demand over the same period. Most other designer brands are tiny in comparison to these two. Except Hermes, which my wife rarely gets hold of so I'm not sure if they've suffered the same decline with scale.
But no joke, if you're looking for quality, Michael Kors is a far better bag.