Sometimes, simplification is not an inherently bad thing. Also different games work in different ways and aping what works for apples to apply that to oranges is not going to work well
Pillars of Eternity has a 6-character limit on the party. D:OS has a 4 character limit. That means that it's harder to fill all the roles in D:OS, and it would be much harder to be able to hit 4 different saving throws.
D:OS also has Memory to worry about, limiting pretty harshly early on what skills you have available to use. I can't afford to spend a slot on a skill which only removes one status effect, for instance.
The more different stats you have, the more numbers you have to try to keep balanced, which means the more numbers that will appear on loot. The more numbers which appear on loot and the more numbers you have to keep balanced, the more difficult it is to choose between different pieces of equipment which have numbers in different areas.
That leads to players eyes glazing over and them mentally checking out of the decision making process. This happens to me all the time when I try to compare equipment in games like Torchlight or Dragon Fin Soup. They have too many numbers and there are too many stats and so I basically stop caring about most of the numbers and just going for what roughly has the highest basic numbers.
That's just lazy on your part and most people that play RPG's a lot don't do that no offense but torchlight is by far one of the easiest stat based rpgs in creation. In case you haven't noticed the more complicated and RPG is in terms of character creation the more people tend to play it. Most people thought Planescape torment was terrible when it was released because they didn't understand it. Now it is considered one of the greatest video games ever created.
That being said, i do agree it is too late for an overhaul. But it is still plausible for a few tweaks and additions to be made for each attribute.
It is never to late for an overhaul we are in alpha if the devs really are reading the forums and taking these discussions to heart then they should see how off balanced the current system is and fix it before release. They don't have to even do a complete overhaul they just need to modify the existing system so that it is better. If you have played a lot of PnP games you can see how to use the existing system to create something that works great there have been some really good suggestions in this thread alone.
While most of the suggestions don't make it any more complicated to distribute stat points and skill points they do nerf the OP builds making the game at least have a little challenge which it is currently lacking.
If I am level 3 I shouldn't be able to fight 20 level 4 NPCs and win by myself with the current system I could which is ridiculous and that is all down to the way they laid out the stats and skill abilities.