I think you are missing the reason for the change back and are suggesting change for the sake of changeeven less intuitive than what we have now.
I would go the opposite:
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5: -5
6: -4
7: -3
8: -2
9: -1
10: +0
11: +1
12: +2
13: +3
14: +4
15: +5
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The key detail of the pre 3.x attribute bonus is that there is a very wide *0, range causing the extreme importance of attribute placement to unwind. - and- it lowers the bonus given to create room for the bonus to be moved elsewhere (ie skills & gear). Your suggestion does the reverse in every way by shrinking the dear zone of +0 & increasing the bonus players can expect to have from attributes.