If your group uses fewer than 6-8 encounters per long rest (which is very common, but outside of the game design), then adding these boosts helps to rebalance martials with casters.
Read the DMG. You will see it uses the 6-8 encounter as an example, if the encounters are at a certain threshold of difficulty. 6-8 was never ever presented as holy writ that you must adhere to or you're Doing It Wrong. Every time I read this, I become steadily more convinced that most people never read the relevant section themselves, they just read someone else say that online and accepted it without checking. I believed that too for a while, before I went back and read it for myself.
Seriously, read the DMG.
Hey look! This thread again!
Obviously, the solution is to make every class as complex to play as a fully optimised wizard or sorlockadin. That's what everyone who plays D&D secretly wants.