I don't play MP but wondering if the new Shared XP is actually making things harder? Z wise. And shortens the game.
For arguments sake say TFPs find a 'perfect balance', where different specialists putting in 'equal' effort gained the same xp. MP progression would still almost certainly be faster than SP. The new changes MM revealed will allow faster progression in a specialized char build, so more resources faster from a Miner type (more stone/hr = more xp/hr), quicker z kills, etc.
While shared xp from z kills certainly encourages group play, a good thing, from vids it looks like zeds can be worth 2-3-4+ times the xp compared to a 'solo' kill. Sort of like if four peeps were mining the same boulder and they all got 75%, that's 300%.
I get why they do this in MMORPGs, they have to balance so that the really selfish players still want to group up with strangers; since they'll still lvl faster in a so-so group than by themselves.
I don't know, I don't play MP in 7dtd, but if it's really Cooperative Play, and folks aren't rushing the end game, then shouldn't shared xp be toned down to a max combined shared xp of X? Where X is a magical average of xp over time, considering distance traveled, ave zed density, etc.
Not meaning to work anyone up with this.

Just seems like there are already so many benefits to a decent CoOp group that large amounts of shared xp may be counter intuitive.
Or I could be completely backwards and TFPs are leveraging the shared xp as a way to increase the GS/difficulty enough to keep CoOp/MP games exciting?
Edit: also consider a group where there are 2 stay-at-homes, 1 mining, other cooking/building base. 3 others kill z's, loot pois etc, as a group, now shared xp is likely to lvl that group of 3 faster than the other 2. And all the combinations. Would make anything other than, 'all xp earned from anyone, anywhere, will be equally shared' impossible to balance.