It will take a bit of getting used to the new colors if they are adopted, but being able to visually separate state routes from the usaush and the other tier 4 routes makes sense.
Curious why you didn't use the same purple that is used on the TM Railways for tier 1 ( i.e. Amtrak). Is that purple too dark when considering the higher density of state routes in any given region?
From
trying it out, I would say possibly (although that might be fixable by adjusting the unclinched color), but also because it's so close to the color used for alternate/business/truck US routes. It's also the color used for Easter eggs (which I think Amtrak started as on tmrail, so it might have just stuck there).
The new colors will definitely take getting used to, agreed, but at least I can say that the more I stare at the way they currently display on tmtest, the more I like it, which is more than I can say for previous color change proposals.