Is there a way to use SortA or SortD on a list in Ans? Is there a way to use them not by itself? Why can it only be used as it's own thing? Uasdf;jklasdlfjkasd fjkl;dfs it's stupid, me thinks.
No, you get a syntax error. You can only use it on a list, like L₁ - L₆. You could do:
:Ans→L TEMP ;L is subscript, for lists
:SortA(L TEMP
:L TEMP; Do this if you want it back in Ans. Otherwise get rid of this line.
;Do stuff with it here
:Delvar L TEMP
I am not sure what you mean by "use them not by [themselves]?" And what do you mean by "used as [its] own thing?" Could you clarify?

Fire Emblem for TI 83/4+ Progress: Demo: 75% Total: 40% Postponed indefinitely
There is no way to do that and it kind of makes sense, but I do agree that it should be able to use Ans as input/output. The only problem that causes is with RAM stuff. For example, if L1 is a 999 element list and you don't have enough room for a copy of it, you will have a Memory error. However, I don't think SortA() will have that problem with its current setup.
Z80 Assembly>English>TI-BASIC>Python>French>C>0
I am not sure what you mean by "use them not by [themselves]?" And what do you mean by "used as [its] own thing?" Could you clarify?
This does not work:
:cumSum(ΔList(SortA(L₁
Because you can only use it in it's own line of code like this:
:SortA(L₁
This is because SortA( generates no output and sorts the list directly.
Ahh. that's because it acts like a program with an input. The program itself outputs its result back into the list. It does not return the value where it is. On some calculators, they display a "Done" message after programs. If you notice, it displays "Done" after SortA(. Apparently, it is "not stable".
See here for more info.

Fire Emblem for TI 83/4+ Progress: Demo: 75% Total: 40% Postponed indefinitely
In this case, "stable" means that if you have a list with multiple values that are the same, they might have their order switched. When sorting a single list, this is not a problem, but sorting one list in respect to another might cause unexpected results.
Z80 Assembly>English>TI-BASIC>Python>French>C>0
Maybe you should add that to the page, that is the way it only works on stored lists and doesn't put the list in answer and can't be used in the same line as other things, etc.