Now explain why all the myriad altcoins which do exactly that are still a speck of dust in the wind compared to Bitcoin.
Because of the price manipulators , which price is all your simple mind can conceive.
Who said anything about price? I'm talking about
utility. A currency I'm happy to receive as a payment because I have the capability to purchase tangible goods and services with it. Other coins can't match the network effects of Bitcoin, which is something you continually underestimate the importance of.
As for your other remark about non-mining nodes and security, I'm not going to waste my time repeating something to you that I've said enough times in the past (to far superior opponents, no less). Suffice to say, you are wrong. End of.