Why was new(size_t s) { } deprecated in favor of an external allocator?

[Paul Backus]

On Thursday, 15 October 2020 at 06:39:00 UTC, Patrick Schluter 
wrote:
> On Wednesday, 14 October 2020 at 20:32:51 UTC, Max Haughton 
> wrote:
>> On Wednesday, 14 October 2020 at 20:27:10 UTC, Jack wrote:
>>> What was the reasoning behind this decision?
>>
>> Andrei's std::allocator talk from a few years ago at cppcon 
>> covers this (amongst other things)
>
> Yes, and what did he say?
> You seriously don't expect people to search for a random talk 
> from a random event from a random year?

It's quite easy to find on youtube. First result searching for 
"andrei std allocator":

https://www.youtube.com/watch?v=LIb3L4vKZ7U

The slides are also available here:

https://raw.githubusercontent.com/CppCon/CppCon2015/master/Presentations/allocator%20Is%20to%20Allocation%20what%20vector%20Is%20to%20Vexation/allocator%20Is%20to%20Allocation%20what%20vector%20Is%20to%20Vexation%20-%20Andrei%20Alexandrescu%20-%20CppCon%202015.pdf