This is the reality.
BTC Miners => 4 Mining Pool operators = security is dependent on 4 guys with over 51% attack vector.

your non-mining nodes do nothing to secure the network.
Just so I've got this straight, you want to present the simultaneous argument that Bitcoin is centralised due to a limited number of miners and also that a distributed network of non-mining nodes don't help at all with securing the network? Is that correct?
Bitcoin is centralized due to the Mining Nodes decisions to Pool over 51% to only a few pools.
The problem is the LIMITED Number of Pools, not the number of mining nodes.
As if their were no pooling, then a mere 4 guys would not control bitcoin.
Remove pooling and that issue is solved.
Sad, your IQ is so low that had to be explained to you.4 "guys" control Bitcoin?
Yes, Dummy the 4 mining pool operators that can collude to over 51%,
read a damn book, you're just too bloody stupid.
Yes your non-mining nodes are as useless as you are in a debate. 
Then why can't the miners control a network of non-mining-node-running-basement-dwellers?

Maybe you should ask why the non-mining nodes can't make the mining nodes pay their worthless asses any bitcoins.

FYI:
Miners have power because they can control the network.
Large Holders have power because they can use economic clout to sway the miners.
Idiots that run non-mining nodes, just to claim they are important, are utterly powerless.
Case in point idiots that run non-mining node have been wanting to receive some compensation for years,
and they still receive $ZERO.
No. When non-mining nodes say they want a kind of block that the miners cannot provide, then the non-mining nodes will reject those blocks.
Happy 2nd anniversary Segwit! #UASF.
Dummy, the other mining nodes reject blocks, yours could accept or reject whatever the fuck it chooses ,
Then reject the economic majority? That would be stupid, like you.
no one cares what your Tandy 1000 computer does in your mom's basement.
Which is why no one pays you $hit.

The miners do. Miners produce blocks the economic majority wants.
Now if Coinbase has an issue with a block the miners will take notice, but you , no one cares.
Reason being Coinbase holds large quantities of BTC and can suspend trading until they get their way, something you can't do.
Coinbase holds economic clout, all you hold is that tiny pecker when you whack off to a segwit anniversary.
Why would they do that? Losing the community's trust would be a quick way to go out if business, wouldn't it.
In fact, the top merchants and miners tried to co-opt Bitcoin, they were hulk-smashed by a community of basement-dwellers.
Non-mining nodes still earns you $zero dummy, actually costs you money but you're too dim witted to understand that.

So.? It's important to me that I validate my own transactions.
FYI:
You have to wonder how many people in crypto are as stupid as windfury,
that when he spends money to run a node, his dumb ass actually thinks he earns money,
with people that stupid, it seems the fanatics out number the sane in these forums.
Maybe if he paid the electric bill instead of his mom, he would understand although doubtful.
Not as stupid as a Zeitcoin hodler though. Hahahaha.
Happy 2nd Segwit Anniversary.
