you might try reading the whole post, I can see why you trimmed the quote too, keep reading & you see this paragraph
In short, the limitation of 1/long rest is effectively meaningless making the original version practically the same value. It's like the difference from having a winning lottery ticket for seventy five million dollars but you need to visit the north pole to claim it & having someone else being given a winning lottery ticket for balance reasons but that ticket is only seventy four point 8 million dollarsbut they can only spend a quarter million per day
I didn't quote that part because I didn't disagree that it's normal to only replace a spell or two depending on situation. for a lot of people. Where it's more relevant is a separate list travelling through the wilderness and then changing it the morning of the dungeon delve and some people do that after they have enough preparation slots.
I joined this discussion regarding arcana when the comments were being made that wizards aren't the best at arcana but the reality is that they almost always are outside of some specialized builds.
I'm going to circle back to a point I made to which you didn't respond. Wizards got things too. 5e separating spell slots and preparation was a huge benefit for them so it's a bit facetious to mention properties of wizards given to other classes when properties of classes were also given to wizards. I made the same point regarding bardic knowledge because the prominence of ability scores in 5e gives wizards a strong general knowledge in all areas of knowledge they didn't have before.
Wizards got things in this UA. Two cleric rituals. That's a solid benefit because of the wizard's ritual caster mechanic. Any time ritual spells are added to the wizard list it's a solid benefit.