KarinsDad said:
RAW does allow for it. You are completely wrong on this. Course, I wouldn't ever expect you to admit to a mistake.
Sure it does. BUt it is entirely irrelevant for the purposes of this discussion, since the rules provide for the circumstance you think is bad. A DM can determine that assistance would not be beneficial, thus not allowing for Aid Another in the circumstances you think it inappropriate. Which entirely eviscerates your argument that the "better rule" should be adopted.
I also note further problems with your "better rule". Using your rule variant, Aid Another is almost always useless in circumstances where the lead character would Take 10 (for example, Bob could not help Adam under any circumstances if Adam was going to Take 10 on his Search check). Aid Another would also be useless in any circumstance where the lead character would Take 20. So, under your "better rule", Aid Another is only useful:
1. When characters are making a check and
cannot make the check separately; and
2. It is not a circumstance in which a lead character would otherwise Take 10 or Take 20.
So, for example, Aid Another is useless for any skill in which a pair of characters could make two checks independently: pretty much any skill other than certain applications of Disable Device.
And it is generally useless for any skill which you could otherwise Take 10 on (under the circumstances in which Take 10 would be usable): pretty much any skill other than Use Magic Device. And Usa Magic Device is a skill that probably would not be subject to Aid Another normally anyway.
So, basically, you've limited the usefulness of Aid Another to: combat, and Disable Device checks. In other words, your proposal is a terrible rule.