A formula for IRR

[DrD]

I'm not seeing the benefit of this:
sto(EDITLIST(L1,"Internal Rate of Return"),L1);
over just this:
EDITLIST(L1,"Internal Rate of Return");

EDITLIST(L1,"Internal Rate of Return"); which saves changes to L1, and sto(EDITLIST(L1,"Internal Rate of Return"),L1); just stores those same results again.

Am I missing something on that?