Of all the answers to this, this is the only wrong one. There's no reason not to allocate them. It takes less than a minute to do and is essentially like having an extra piece of gear in a stat of our choice.
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30 points don't scale with gear. The better gear you get the less impact these extra attributes have.
Unless we get a significant increase in points when leveling to 60, these extra attributes will become even less meaningful as better gear is introduced to the game.
For me right now it is a nuisance to remember to assign them as I level.
Reset my pld to full vit due to very low gear ilevel was a nice bonus, as my ilevel is increasing I'm gradually swapping it back to str
While this is almost always true, there are games that do this correctly (though I'm not sure if there are any in this genre). Path of Exile comes to mind with an enormous multitude of useful builds. Sure, there probably is a mathematically correct build, and that game's system is aided by dynamically generated equipment that will alter your stats (the very opposite of the terribly static offerings we have here), but with enough variety and finesse you could create a talent tree (or tumble weed) that offered a lot of customization without a singular standout winner.
The problem is that it's exceptionally difficult to design lots of alternate skills/ abilities/ stats that are so close to parity without being almost literally the same, that most developers don't try.
I can't be bothered to equip a body piece of armor.
I can't be bothered to map Shield Oath to my hotbar.
I can't be bothered to get Provoke cross class skill for my Warrior.
See where we're going?
On the point of diminishing effect, if we don't get a massive amount of points in the next 10 levels, they'll probably prove to be more effective placed into a tertiary stat. I don't know the maths, but as it is the 643 str I have now wouldn't be reduced by even 5%, whereas (for the moment) , I could rock around with 435 more HP, boost of over 6%. The idea being that a monk never gets hit not withstanding.
Perhaps dex on PLD would have been a better argument (Block and parry), but I don't know the math there at all.
As it is though, it has use, but it's not so important that it matters if you mess it up, though it's easy to correct. On the other hand NOT using the points is flat out stupid. You may as well bin your weapon and grab one from 10 levels earlier.
Honestly even that's only applicable to a few people. If you're really pushing progression, you can get far better value out of crafted gear than the 1:1 tradeoff that your allocation gets you. If you're way behind then you're better off just overgearing your way to the extra vit. So allocating vit for progression survivability is only a particularly good option for people right behind the hardcore crowd, who might not have reasonable access to crafted gear.
Also @ the people claiming it's better for general-purpose survivability... idk man. 30 vit translates to about 450 hp. So yeah dead dps do 0 dps and all, but if 450 hp is what's keeping you alive then there are other problems that should be addressed. If it works for you then cool, but be cautious about giving that out as general-purpose advice.