Shouldn't they kinda have figured it out
before publishing the game?
There's this game in the US that kids play, we call it "telephone". The basic idea of this game is that you take a large number of kids and they sit in a circle. One of them comes up with an innocuous sentence, then whispers it into the ear of the child next to them. This proceeds around the circle, each child whispering what they heard. Generally by the time this gets all the way around, the sentence heard only barely resembles the original statement.
This illustrates a point. The more people involved in a piece of communication, and the more hands it has to pass through, the more likely it is to get distorted. Hell, at least we all got readable, generally gramatically correct rulebooks.
A lot of stuff slipped through. There were, as I hear, a lot of versions of playtest stuff. I know the WotC guys I play with still make rules errors because they'd playtested lots and lots of versions of pretty much everything in the game and still have old, changed rules floating around in their heads.
As it is, we've got a very workable set of rules with a few inconsistencies throughout. None of the inconsistencies I've seen are game-breaking, just confusing. And, all things considered, has anyone played a tabletop RPG that didn't periodically require a DM judgment call because a rule was ambiguous or simply not there? This is nothing new.
It just makes me wonder when we see the "Why hasn't WotC answered this question yet?" posts. When the response is "they're working on it, give them time, the lack of answer isn't stopping you from playing the game" and you reply "well, then why didn't they not let the error happen in the first place"... it frustrates me a lot. There seems to be a lot of that going around. So the RAW aren't perfect. I'm still having a blast playing the game.