We know that 99.85% of all votes (by rshares) are cost within 7 days. We also know that 99.5% of all votes (counted equally) are cast within 7 days.

This is a circular argument based on the current rule set (and UI). It can't be used to evaluate a different proposed rule set.

A similar (bogus) argument would be that comments only get 1% of rewards therefore rewarding comments isn't needed.