I feel that progression is in the eye of the beholder(s), really.
I see Ashley’s viewpoint, and in my personal opinion - I feel that currently, “end-game” Vermintide 2 is having “The Best of the Best” gear with what I feel are the “coolest” illusions on my gear (the red illusions). I’ve rolled perfect 300-power oranges (which are essentially “Reds” to me), however, it’s not easy and entirely RNG based. It’s not a reflection of skill or time/effort put into the game - as I’ve beaten 20x more legend missions than some people I know. I win a lot of games, yet I see people with 10x-20x less time spent in this game “catching up” to where I am rather quickly, and “surpassing” me with great luck on finding reds. It really does feel like a slap in the face sometimes.
End game to me (as of today’s date) is having all reds with the cool glowy illusions on them. All I know right now is I have a goal I’d like to work toward and I’d like to be rewarded for my time/effort put into it - which is a lot of time, and a lot of effort.
End game to someone else may just be beating Legend on every mission.
End game to someone else may be getting a single character to level 30 and treating it as their “Main” and not going any further.
It’s hard to say, but I feel that if someone is looking for “progression” after hitting level 30 on all characters with full orange gear - red is it … and illusions + cosmetics (again, my personal opinion).