Dimension the curve to incentify orca's not to break up their stake into hundreds of minnow accounts, and you will screw over redfish accounts so badly that the incentive for new users to join the platform should become close to zero.

Agreed. The big issue with the convergent linear proposal is that it penalises low earning posts heavily to prevent a single entity spreading their stake over many small accounts. However it cannot differentiate between such accounts and actual small accounts. Since 70-75% of accounts earn less than 1 Steem per month, this is a pretty big issue.

For me the cons of the convergent linear are that:
(a) It reduces earnings for new / small accounts, thus harming mass adoption.
(b) It harms engagement by reducing the incentive to make comments, which typically gain low rewards.

Whilst your solution is elegant, it still pushes rewards away from low earners towards higher earners, although to a much smaller extent than convergent linear.

I think the proposal in the EIP to move away from linear is unnecessary. The original issue being raised, that of a large account splitting into smaller accounts, could be tackled through other avenues, such as using data analysis through MIRA to bring such accounts to light.