This is exactly why we don't want large miners to have an unfair advantage over small miners...
Discussion
Yes, but if it is the justification for 1200X the OP_RETURN size — a change the community found contentious and that Core pushed through with a heavy hand, sounds weak.
The extra revenue from Slipstream is marginal.
adds, what, a 1% edge at best? Block rewards still make up the overwhelming majority of miner income.
No one is changing the Op_return size allowed on chain, they are bringing mempool in line with what's aleady allowed on chain.
Mining is a cut throat business with ultra thin margins, 1% is huge, which is why miners are running parallel transaction markets for transactions that mempool doesn't relay.