I tried it in creative. Go to try by yourself with BM on day 70+ (settime).Try it once, then tell us how it feels to be level 300, the chuck norris himself.
Replayablity is ♥♥♥♥ed up if they do that. Making every build viable in some way looks more intersting to me than grinding every game to level 300.
The ultimate idea : Give player max level 150 or so, then add a very rare magazine (quest drop or rare loot) which gives an extra permanent skill point.
This adds very late game grinding to eventually be the chuck norris, but keeps it capped for most of the time.
You need to be Chuck to fight what will come from the dark.