Right. Let's have 6.0 NOT fix Freeze, Scathe, or Fire II, nor replace them with anything more functional. We'll just leave them optional to even keep on your bar, or outright remove them from the game. There. All so that pairs of abilities that are mutually exclusive to each other, and have zero reason to occupy separate slots, can occupy separate slots.
While we're at it, let's remove Upheaval, Shake it Off, and Raw Intuition to return Fell Cleave and Decimate to their rightful places and make it cleanse that muddling bastardization that packed what was clearly two abilities into that single title of Equilibrium -- now called Angry-but-Healthy and Overpower-More, available only in Defiance and Deliverance respectively.
No one is saying to let other issues lie. They're just pointing out that when you can fix an issue -- even a minor one -- at absolutely zero cost, you may as well do it. There is no harm in having the option of two further hotbar slots available. There is benefit, but there is no harm. That's an improvement.
Not wasting buttons for zero benefit is objectively better design than wasting buttons for zero benefit.