You really did not think this through.
OK, you are asking for a strong centralized form of government that dictates all instances of life. Some unnamed bureaucrats or “elected” critters in D.C. comes up with laws based on what they think is right and impose them on the rest of the nation. That is what you want?
Now, remember who the President is and what side is in charge. Oh shit! It is Trump and the Republicans! The People you hate because they are Fascist!
You just endorsed the Fascism you claim to hate. [/end sarcasm]
And when you say, “Is there a point to a United States?” Allow me to cite a document that should have reread before posting the stupidity above:
That these United Colonies are, and of Right ought to be Free and Independent States; that they are Absolved from all Allegiance to the British Crown, and that all political connection between them and the State of Great Britain, is and ought to be totally dissolved; and that as Free and Independent States, they have full Power to levy War, conclude Peace, contract Alliances, establish Commerce, and to do all other Acts and Things which Independent States may of right do.
The basis of the United States of America as stated in its most original document is the actual thing you dislike.
And for “I prefer continuity and predictability.” you are stupidly assuming that if that is achieved, it only means good things happening to all peoples because Central Government will be benign and all-loving to the People. But I lived in a country which had continuity and predictability and every election there was a predictable switch of sides (sort of ‘it is my turn now’) at governance and access to public funds which invariably were stolen. There was a continuity of politicians promising to fix things and then the things like roads and health care and public safety remained unchanged and inefficient. If you had to obtain a permit, renew a license, process some central state-mandated duty, you would predictably have to pay bribes to get it going or wait for the inevitable months or years of delay. We lived in a continual state of fear from the criminal element and predictably, you could not depend on Law Enforcement because they were part of the criminal element or paid for by them. And if you got too loud protesting against the continued uselessness of that Centra Government, you would predictably get a visit by certain officers who would offer you the chance to correct your behavior via arrest and imprisonment while you were being investigated for trying to upset the continuity and predictability or just outright become part of ecosystem with a perforation in the back of your head.
Dear God: Spare me from the Unicorn Fuckers and Assorted Political Fairy Godmother Wishers.
Reminds me of a quote from, I believe, Car Talk. She is unencumbered by the thought process.
Another point ... The state model allows us as a nation to experiment with different approaches to problems and issues, with at least some higher level oversight and backup should something go seriously off the rails. That's a feature, not a bug.
"Give all the power back..." -- who proposed that?
What does get talked about is to restore to the states the powers they retain under the Constitution, and to make the Federal government obey the limitations in that document. That would, of course, trim the Federal government to perhaps 5% of its current size.
A unitary omnipotent Federal government was proposed during the Convention -- by Alexander Hamilton. It's worth reading (James Madison quotes it in full in his "Debates in the Federal Convention of 1787". You'll be horrified, and you'll understand why Neil Smith in several of his novels called the advocates of unrestricted government control "Hamiltonians". But that proposal went down like a lead balloon, not even getting a second to be discussed.
Unfortunately, TR and Wilson and FDR and their ilk gradually implemented Hamilton's plan in practice even if it never appeared in any words. And here we are...