It consumes less electricity.
Miners or delegates or validators or whatever will expend
resources only to the extent justified by transaction processing profit margin, which delegates in DPoS will also do. In fact DPoS may well have high profit margins because the number of delegates is fixed, making it a closed market.
So perhaps less electricity, but if so then more resources expended on something else (politics most likely).
(This assumes that the coin distribution phase of Bitcoin is over or insignificant, which must be done to meaningfully compare with DPoS since DPoS is incapable of distributing coins at all.)
Thus
as I pointed out in 2013, a very high incentive exists to centralize mining, because transactions fees are a Tragedy of the Commons. We keep coming back to the research I did in 2013. I had already figured all this stuff out back then.
I had even pointed out the block size issue back in 2013, which is now the raging problem today with BitcoinXT alias GavinCoin.
Since I already argued that one can't mine with lower economies-of-scale without losing hash rate share over time
I don't agree
with your argument that your argument is conclusive. You need to show that economies of scale are net positive
at the economically relevant scale, which depends greatly on many undetermined factors.
I don't understand why you argue that economies-of-scale could be anything other than net positive at increasing scale? Afaics, the only way that wouldn't be true is if mining is not profitable any scale (which is what I hope to achieve in my design).
Also how will you compete as a miner against a increasingly globalized government cooperation which will spend up to 17-18% of the global economy perpetually (the Laffer limit for taxation) to insure it can tax the crypto-currency economy? The government can subsidize miners who comply with demands to censor transactions which do not have KYC, so that they government is not rendered extinct by tax avoidance.
Besides the government can leverage up that 17% homeostatic rate of healthy taxation by using regulation of ISPs.