That’s the point the goal is to make the gameplay more challenging and extend it, the current system kills that.
You're probably a better player than me then, since for me the current difficulty level is perfect.
I don't even play at bullet-sponge difficulty levels, I play on a humble Warrior difficulty, so I guess you're one of those guys who can win a horde night running around in the open naked with a basic club.
If you invest in a single attribute from the very beginning, you become very strong.
Here's another thing I don't understand, and again, maybe I'm much worse at this game than you are. If I'd put all my points on one attribute in the beginning, I'll surely be a bit stronger with the weapon of that attribute, but I'd also probably starve or die of dehydration because my basic survival skills would probably be all at zero.
So, I don't know, maybe you are much smarter than me and find ways to have (e.g.) 5 STR and Lvl. 3 Shotguns and Clubs in the first few days. Well, for me that's simply impossible.
I won’t even mention players who max intelligence just for the books and the stun baton, which to me is complete nonsense, and how anyone can swing that electric stick around for half an hour.
Two things on this: 1) every player is entitled to have fun as they like ... 2) this is the typical tactic used by min/maxers and, as I said, the game shouldn't find "solutions" based on how min/maxers play. It's a rabbit hole in my opinion.
The fact that you start with 4 points is ridiculous.
I disagree. Many Role Playing Games in the past started with your character profile or job. You had a bunch of points to distribute and make the starting character something other than a creeping ameba. That's exactly in line with RPGs in my book.
I can understand books in terms of progression, but for action skills, I have no idea why people like this system. Could you explain to me what you like so much about it?
What do you mean "for action skills"?

Aren't books used to learn new recipes?
You mean the Perk books? If that's what you mean, well, personally I also like the perk books because they add an additional goal to strive for and give you the option to make your character even more specialized in their role.
I really don’t know what the appeal is. I’m seriously against the whole “learn by doing” concept like before, but a hybrid system could satisfy a lot of people and slow down progression, and make it more natural. Or you simply don’t think this solution is bad, you just have concerns about how TFP will implement it.
The current system is good enough for me. I also like finding books in mailboxes and whatnot. When I go across a town, I'm always looking forward to looting places where I can find books, but, for example, sometimes I wait until I've put points in a skill I want, so that I can have more books of that type when I start looting.
Perk books specifically, add so much variety to the game and make me want to go around more.