In other words, not nearly as burdensome as you would like to make out.
The AGGREGATE liability isn't the problem. The problem is the RELATIVE profitability between one part of the new blockchain supply and another. Weakest link in the chain drags everything else down. This is what makes us uncompetitive (relative to 100% mined coins) because they are able to absorb more of the overall buying demand than we are across crypto in general. They SELL ALL of their new supply, drawing capital value into the chain from every last coin their chain issues. We just give half of our supply away.
The massive tax liability that the MN reward sector incurs is just one signal of this "ill health" situation. It's a signal that we've got something wrong. It's wrong by Ryan's own criteria - even if you accept his premise that the supply should be restricted from the sector that "sells most".
So I don't know why you're still defending it. Something needs to be done about it.
(...and we aren't even getting any node growth. Because the Dash-denominated reward is not enough to offset dollar-denominated capital loss and opportunity cost of capital gain from 100% mined competitors) All these signals are pointing at the same thing. We've got the reward ratio
wrong-wrong-wrong. We adjusted it in the opposite direction to what was needed. We need more dollar quantity and less Dash quantity in the MN reward which can only come from slashing the huge blockchain free give-away we have and starting to capitalise the supply again.

P.S. I just realised how B.S. you argument was. You're measuring the annual tax liability from the FLOW (the ongoing mined supply) as a proportion of the STOCK (all Dash ever mined) ! LoL. That would be like me saying I only pay 0.5% in tax because I've worked for 30 years and I'm measuring my this year's tax as a proportion of everything I ever earned. That's the kind of idle gatekeeper hand-waving qwizzie would have come up with to pass the time & distract attention. Maybe you've got the job now.