How can you be competitive at mining today?
Frankly, I don't know. I do not have available time to perform the calculus. Perhaps someone who mines can chime in here. Searing?
However, near-leading efficiency miners are available to anyone willing to spend on them. (though you'll need BCH to buy them XD ) Being in business is _hard_. It is not for everyone. To that end...
*Unless a change in POW helps to equalize mining power by making costs harder to scale.
...Your apparent belief that a change in PoW will make any difference in centralization is unpersuasive. No matter the technology, mining power will coalesce to those that possess the financial resources, the BizOps acumen, and most importantly the persistence and pain tolerance needed for entrepreneurship on a grand scale.
As I have been saying for literally years, the stupid centrally-planned production quota that limits capacity is stifling adoption. I expect S2X (in comparison to S1X) to allow double the number of transactions per second, per hour, per day. Therefore reenabling use cases that have been obsoleted by Cores insane Raspberry Pi fetish. More use cases = more usability. Pretty simple calculus really. Oh - and lower fees besides.
What you call the "insane Raspberry Pi fetish" is the David-against-Goliath guarantee that verifying ...
Yes, you can verify all blocks with a non-mining, fully validating* 'node'. What does this verification buy you that carefully watching your SPV chain provider does not? Nothing.
* Do you maintain a fully-validated copy of the blockchain? I posit that most operators of 'non-mining, fully-validating 'nodes' ' do not. Are you aware that starting up a Core node does not validate historical transactions before a given checkpoint?
... and keeping the big guys in check ...
Your non-mining, fully-validating 'node' does absolutely nothing to 'keep the big guys in check'. The only thing 'keeping the big guys in check' is the potential threat of economic power abandoning a given chain. And node count has an uncorrelated, Sybil-able relationship to economic power.
...has a cost small enough for anyone to be able to afford it!
Perhaps most important, the notion that the world's uber-money be beholden to the absolute lowest-denominator in computing power is -- I reiterate -- insane. Buck up, buttercup. If you want to be a cog in the most important financial machine humanity knows, spend a quarter-Bitcoin on a real tool.
No mining rig required. That's exactly the point of decentralization.
Nothing that I say is incompatible with decentralization.
You want greater adoption? You're not alone, jbreher. We all do, of course! But if adoption comes at the price of pushing Joe "David" Average out of the loop, it's just Visa-like adoption, not financial freedom-adoption. Can't you see that?
What I see is that there is a balance to be had. Indeed, the soul of engineering is the same as the soul of economics -- balancing multiple competing offsetting considerations to arrive at some sort of operating maxima. With Bitcoin's loss of market share from 85% to below 60% (indeed below 50% for a time) coincident with persistently full blocks, Core's direction is not seeking a maxima I can live with.
It ain't Bitcoin Cash, but it's double the goodness of S1X.
If big blocks are what you really think you need, you've got BCH already. What's the point of S2X then?
A hedge. Against a continuation of the insanity.
Bigger blocks are indeed a problem if usage ramps up. Latency, bandwidth and mass memory requirement would skyrocket for simple Joe "David" Average verification, not only for mining.
Joe "David" Average's verification is of no value except to that individual Joe "David" Average.
Censorship resistance would be seriously impacted.
Absolutely not. Censorship resistance is a lack of institutional barriers to being a first-class participant in the system. It has nothing to due with free as in beer.
I refuse to believe you don't see that - you're too smart not to. That's why I was asking for your true motives.
I guess you just don't want to tell us.
I have told you. Repeatedly. I really don't know how I can be any more clear. Sorry.