I understand that decisions of other players has no impact on the outcome of your hand. The overall impact of not following basic strategy has equal chance of benefitting and hurting the other players chances of winning

However, if a counter is generally on playing positive counts, wouldn't the tendencies of poor players skew towards not hitting or splitting when they should, versus the opposite? And wouldn't that lead to fractionally more hands available at a higher count?

I'm not implying that the impact would be material, but that there is some marginal favorable impact.

Obviously, there is significant positive impact from others "poor" play in relation to house rules and comps. But my guess is that you'd occasionally get an additional hand dealt at a higher count as well.