I don't care that you believe that. When it comes to player characters generating their stats using the default version of the rules
The thing is that the default version of the rules is just a piece of paper, it's not a game and it's even less an actual gaming session, these can only exist when a dungeon master has appropriated the rules and is running the game, which implies him making choices about character generation methods if he feels like it, like every other aspect of the game, it's within his rights.
, I'm not budging on this. You enforcing your preference on others for now other reason than you like it better, is not acceptable to me. I don't care if you think the rules of the book give you the right to do so, if the Standard Array was meant to be optional, they would have made it optional like they made point buy.
After that, it's true that rolling and the standard array are in the core rules as alternatives, so a DM, especially a beginning one looking for simple choices is likely to choose that.
What I think is more significant to this discussion, however, is that this points in your direction below as being the standard used by the designers in terms of quantifying standard character powers, and this in turn influences all the computation made about CRs, encounters strengths, etc. See below.
You are deciding that because you think a character with the standard array is boring, a player isn't allowed to use the available option if they do not want to randomize. This is no different than saying that since you find a paladin with a longsword boring, all paladins must use hammers. You don't get to make that call to enforce your vision on a Player Character, they are not a Dungeon Master Character.
This, however, I'm in complete disagreement with. It is every DM's right to enforce rules about character creation, their power, how they are generated, which races and classes are available for play, and ultimately whether any character is allowed to adventure in his world.
Thank the gods, 5e has moved away from the player-centric atrocity that was 3e, which gave players the impression that they had "rights". If the DM is a good one, he will of course try to make his players happy, but it is his right to block attempts to derail the whole campaign for the whole group by players who think that they have "rights" to do as they please.
My apologies in advance if this is not what it means, bu words like player "rights", "agency" etc. have ruined many many games for DMs, when at the same time players (often the same) weep for not finding DMs...
And I've shown how the designers decisions lead to the 16 being the most commonly seen prime stat. They did it in three different methods. If that does not show their intent and the point was to have a different result, then they must have expected the majority of people to not play archetypical combos.
On this point, however, I fully agree, it is the basis for computation in the system, so much so that powergamers who create more powerful characters than this are then the first one to complain that the encounter system is broken.
It does not mean that characters have to be created like this, and especially not using specific method, but it is the standard that drove the computations of the rest of the system.