Most enemies in the game has 12-13 wits/initiative point. Go above that and you start first. This is later increased to 17-20 as you go through the game.
In other words, there's no practical way to keep your initiative ahead of the enemy. Let's say you can reach level 7 in the alpha, and let's say you start out with 10 Wit. You'll need to dedicate all 10 points from 5 out of 6 total level-ups in Wits just to keep it at 20, leaving you with 2 for the rest. That seems like a pretty lopsided investment.
It's not 17-20 for everything though, very few monsters have that much Wits. With 15-16 Wits, you usually start first or second in a fight on even the last fight and otherwise, it's 1 or 2 monsters before you and they won't manage to do much.
Plus, you mustn't forget all the stats you get from gear.
With 14 total points to spend + 2 from racial, 5 points in Wits for at least 2 characters to prepare the field for the 2 slower party members is more than enough.
You still have 11 points to spend wherever you wish and you can't forget the fact that gear also gives you stats. Even if you spend like 3 or 4 points into memory, you still have 7-8 points for your main stat.

And a tank doesn't need more than the bare minimum to wield his weapon in a main stat, leaving the rest for his Consitution.
My tank had like +4 or +5 in Constitution from gear alone at the end of Act 1. Add to it Encourage from a human and Burn my Eyes from a Pyrokinetic and you'll have so much stats you won't know what to do with it. He was walking around with nearly 30 Constitution and 20 Wits while still having plenty to both Strength and Intelligence since he was Hydrosophist, Aerotheurge and Warfare. My cleric tank that would just as soon stomp you to the ground as heal you.
My 2 handed warrior had 10 Wits and everything poured into Strength and a bit of Constitution. He was a walking death machine but always started last. Which was to his advantage since it meant the rest of his team would prepare the field for him and he could just crush everything once they got teleported in a tight pack for him to cleave them and crush everything with Warlord talent.
Honestly, I'm quite happy with the current stats system. Each stats feels meaningful (Constitution could probably use a bump). Usually, in other games, you just stack everything into one attribute, which makes for pretty boring character progression.