I've heard that some people disliked 1e because it wasn't enough like Gygax's campaigns.
Supposedly some people disliked 2e because it was too story oriented.
Rumor has it that some people disliked 3.x because it was too rules heavy.
According to some, there were those who disliked 4e because it was too video-gamey.
And there some who even say, there are those who dislike 5e because it doesn't have enough rules for buying magic items.
*The above, does not necessarily reflect the opinion of this author, ENWorld, or any affiliated forumites.
My point is, you can never please all of the people all of the time. I prefer the rules as is, so unless they provided both, I'd have been disappointed.
That's not to say that they won't ever provide a fixed price list. Maybe they will and we'll all have our cake. The game is still quite young. I don't think it's unreasonable to give them some time, especially given that the design team has been stripped to practically nothing at this point. If it's something you can live with, make due. If it's not, homebrew something that suits your needs or find someone who's already created what you need and use theirs. Or don't play 5e. (I really don't mean that to sound harsh, but if it's something you can't live without, and you can't or don't want to get a homebrew stopgap, then what other choice is there?)
I don't think it's entirely fair to say that the designers failed or were trying to exclude anyone, simply because they left out fixed prices from the DMG. They did include prices, so clearly they were at least trying. I understand that not everyone is satisfied with those rules, but that simply proves that "you can't please all of the people all of the time" holds true.