Good insight for National Geography and other advanced pros kind of photography. Nevertheless I do not think I could photograph my beloved family indoors with ISO 100 or 200, nor wish to take a time tight trip overseas with 2 lenses only and my wife besides.
Funny, but at tourist frequented sites, if you know how, becoming another clumsy looking tourist could be a good camouflage for an advanced amateur. And truly clumsy tourists sometimes produce great images too.
Much more important than traveling light, in my opinion, is the quickly passed by point at the article, about spending time with your subject, both for becomming part of it, and start to really seeing your prospectivve images. But for this you have to have lots of time, patience and empathy. Patience and empathy depend upon your character, lots of time depend upon money. It is the exception to the rule whenever professional photographers have been able to do what they wanted instead of what they have been paid for to do.
And in my opinion too, the most important aspect of photography, as of life, is to have fun or/and satisfaction. For this, in life as in photography, there is no rule at all.
Cheers,
Ruben