RPG rules aren't perfectly clarified or non-existent, they're always somewhere in between. 3e and 4e took big steps towards clarifying everything. This hurt some tables, and helped others. Some DM's and players obviously prefer clear rules for everything and some prefer an approach more open to interpretation.
What I like about 5e, is that while it won't please everyone, it appears the pendulum is swinging the other way, yet they aren't abandoning player agency. The DM is getting more of a say about how their game runs, yet there is still more room for player choice. There are more player character choices in this PHB than ever in the classes and background selections, yet how the game runs appears more up to the DM. Tactical options are just that, options. Feats and multiclassing are options. I expect we will see a lot more options in the DMG. But whether your rogue can attempt to hide or not in a given situation, or exactly how polymorph works, or whether your get advantage for swinging on that chandelier, that's up to the DM, so I sort of see the OP's point; errata or clarifications may be needed, but I'm not sure I want too much of it either.
Give what is the DM's to the DM (how the game runs) and to the player what is the players' (strategic choices for their characters). Seems like a win win to me.
That said, some tables aren't going to be comfortable with the DM having more freedom because there are bad DM's out there, and there are bad players who will try to exploit DM agency. IMO that makes for a bad experience regardless of edition, and the rule set isn't the issue at those tables anyway.
Finally, I don't care about organized play, so I admit that this edition may not work best in such an environment and those with concerns about it may have a point; I just don't know enough about it. If you approach D&D as a tournament that you win, or simply look forward to an experience that is standardized, I can see why less standardized gameplay with more DM rulings would annoy you. But since organized play can add additional rules as needed, I don't see this as a long term issue. It should be able to adapt; I think it may take some time though, but again as far as organized play, I'm just speculating, I don't know.