By that logic, 812 and 821 would be weak, which is true. Same
for 813 and 823, for that matter. Not so, 831 and 832.
Then you've got some real baddies like 867 and 876, plus
a number of other pushes (e.g., 8/7/125) that really put the kibosh
on the 8/a/a strategy.
Better to pick your spots.