Trendy color powder runs can render pro lenses “financially not feasable to repair”

[OWC Jamie]

Lenses aren't exactly hermetically sealed. If a zoom lens was you wouldn't be able to zoom as the required volume of air change wouldn't allow the lens to pump ( without a expensive and extensive pneumatics system).
There are too many levels/standards of weatherproofing.
Pros buy pro lenses and will spend the money to have them cleaned out after extreme use.
Or rent and return. :-)