With that in mind you must understand that unless the pigments are set they can come off, and if you look at the longevity of an expensive model in a case or on the shelf, inevitably they are going to get dust on them, and need to be cleaned.
I've been building since 1977, and many of my models have required cleaning at which point the "Pigments" would come off.
Whats mind boggling to me is that everyone buys into the marketing like "Pigments" fell out of the sky yesterday, while myself and other decades long model builders have been using fine artists pastels (ground down) for decades and not calling them "Pigments". If you go to a real art store they will have every conceivable hue of sienna (for instance) which would be used for rust. Far more shades than Mig could ever produce and stay in business, and a pastel stick would give you about four times as much as one shade in a Tamiya weathering kit for that particular shade.
I really prefer to use Grumbacher or W&N artist oils which permanently set with odorless mineral spirits, if dust is requires I will airbrush a very diluted base color coat to trim contrast before the oils. I just did an Eighth Army desert dio which required just that.
Just things to consider.