Sorry, I don't see it. As I've said already, you are still restricted by your skill number and your health, magicka, and stamina. So unless you are a power gamer, or an OI abuser, this is not broken and it wont allow you a super easy or op advantage in any way. If you are a power gamer or OI abuser, well, you already broke your character in a sense anyway, so no further damage was done. My point is the leveling system was already easily broken if the player wished to do so, so this really doesn't do anything in the grand scheme of things when talking about Skyrim's leveling system.
Yes it will.
The 20% cooler perks on many trees are absolutely useless for end-game and are only taken because they're not useless pre-endgame. For example it's possible to hit the armor cap with both light AND heavy armor by only taking one 20% cooler perk. This allows players to go back and take out perks that are basically useless, thus allowing the player to take all the good perks.
What you're doing is expecting people to limit themselves. This game was designed with the idea of letting people play however they want, and for some people? That's using all skills. You're suggesting nothing but a self-imposed limit, which has nothing to do with the objective base game design. This new system easily allows anyone and everyone to craft their OP armor, then perk everything long-term, like weapon damage, sneak ability, block and marksman, and all magic skill trees.
To say it's "abuse" on the player's part to use every tool they're provided with is ridiculous. And I'm saying this as a person who never ever ever uses perk respec systems. The point is that Skyrim -literally- just lost the little RPG elements it had in that Dragonborn allows you to respec your pure warrior to be a pure mage or a pure thief at will. The point is that again, practically NOTHING you do matters because it either has no consequence or it can just be fixed as you see fit later on.
That's just it...you can't. Sure, you can get rid of the perks you put in, but unless you have actually invested the time to increase the skill, you cant just put all of your perks from one tree into another. And even if you did, a warrior will never be as good as a mage who invested their time in that build from the beginning due to health, magicka, and stamina.
Refer to the black book abilities and the gear potential from mastering Alchemy, smithing and enchanting, then you'll think twice about that statement.