I think
Caliban said it all, but I will just reiterate.
In my example I wanted a half orc who's strong, clumsy, fairly intelligent but doesn't always think things through (low wisdom) and is friendly and sociable. Those aren't numbers, those are descriptive attributes that I convert into numbers, something which point buy allows me to do easily.
You seem to be the one obsessed with numbers defining who a character is.
Do I have a hard limit on how high my strength can be? Sure. If I roll stats and get lucky, I'm still limited to a 20. So?
On the other hand if my concept is that I'm really an alien from Krypton that can shoot laser beams from his eyes while having a 100 strength, I'm playing the wrong game.
Let's take your previous example: the blacksmith wizard. You wanted him to be smart enough to fulfill the role of the party wizard, so gave him Int 16 (after racial), but wanted him to have enough strength to justify his smithing background, so Str 14. So far, so good.
Then you were trying to decide whether he is sociable, OR whether he is perceptive/agile/tough. You
cannot have 'what you want' if 'what you want' is all three!
That concept
cannot be realised through point-buy.
Which is
why it's misleading to claim that point-buy lets players realise the concept that they want. Point-buy
only lets you realise the pre-conceived idea
if that idea adds up to exactly 27 point; a fairly small proportion of all possible PCs with stats in the 3-18 range and the concepts that match them.
It
is true that one of the advantages of point-buy is that it allows you to conceive a PC ahead of time and know that it will be legal in the game. Since rolling has you conceive your PC
after rolling the stats, which is objectively no better or worse then concept first, then it's not an appropriate criticism that rolling doesn't let you do what you're not supposed to do with it!
If 'rolling mean I can't use my pre-conceived PC' were a valid, objective criticism of point-buy, then 'since the DM's character creation method means that I have to generate scores before I conceive my PC' is a valid criticism of pre-conceived PCs. If rolling for stats is part of the game, then conceiving your PC after rolling is not a bug, it's a feature. It's how the game is played and how it has
always been played.
Point-buy is a comparatively recent thing, compared to rolling your stats. It has its own advantages and
disadvantages over rolling. It's advantage of pre-conception is opposed by its
disadvantage of those concepts being limited to exactly 27 points, instead of a host of new concepts, impossible for point-buy to emulate, open up nearly every single time you roll up a PC!
Let's say that you can have
any meal you want....as long as it adds up to exactly 1000 calories. Sure, there are many, many meals you
can have, but think of all the meals you
cannot have, that you
could have if instead of a calorie total you could eat whatever was in the market that day.