UBI as a productivity dividend

I tend to think a job guarantee would work better than UBI: have the government provide a job to anyone who can't find one somewhere else, something like what was done in the 1930's in the US. Come up with a list of things needed (can you think of anything that needs fixing?), and pay people a living wage and benefits to take care of those things. Call it 'Universal Basic Work.'

Beyond spending government money to take care of the country and beyond providing those hired with enough to take take of themselves, it'd force private employers to pay and provide benefits at least as well as the government UBW jobs if they want to hire employees.

I further imagine that a person making enough to get by would be less prone to being hopeless and frustrated, supporting social cohesion. And that there's a dignity in that both for the individual and the community they are a part of.

Why, instead of centralised planned economy that failed ans killed millions people many times in history, not just lowering taxes and let people to decide how spend their capital individually? Game theory applied on UBI sounds really like an ugly idea.

~20 years ago, when UBI was a popular idea in my country, it was understood as a technical fix to the welfare and tax systems. It was supposed to simplify the systems and make them easier to understand. It was supposed to fix the perverse incentives people with low wages face, such as the extremely high (often >80%) effective marginal tax rates. It was supposed to automatically give people the benefits they are entitled to, without having to deal with the punitive bureaucracy. It was supposed to help people who fall between the categories in the existing welfare system. And so on.

And it was supposed to be funded by making it an accounting technicality, at least for the most part. Most basic welfare benefits, tax credits, and tax deductions would go away. Progressive taxation would go away. Standard deduction would either go away or become substantially smaller. And the highest income tax bracket would start at 0.

I'd be really opposed to this. It'd only be ok if we nationalized the industries where we set these rules and rates. Otherwise, this ends up being a simple handout to private industries.

For example, let's say we say x liters of water. Well who's deciding how much x liters cost? If it's a private company and the government is guaranteeing it, you can bet water (which is relatively cheap where I live) will end up being the most expensive resource imaginable. And that may actually be true depending on the location, but it'd also be true in non-desert areas with plenty of water.

We've effectively had that here with the ACA, where the government has decided that it will cover the first $800 or so dollars of your health insurance. What happened? Magically, the cost of health insurance increased by $800. Private industries aren't stupid, they'll always charge the maximum price the market will bear. And when we start talking about captured industries like data provider, power provider, or your water provider... well that's where we can trust private industry the least as they literally have the public over a barrel. Utility boards are an OK solution, but the better solution is to turn these into public institutes instead of private ones.

(a) sufficient political donations/bribes to get lawmakers to draft suitable language themselves (or via their staff)

(b) a combination of political donations and a worldview on the part of lawmakers in which it is "just normal" for those affected by regulations to draft them, such that you yourself are able to draft the legislation.

There are levels of government where neither of these require incredible levels of wealth, I suspect.

Both could be stopped by limiting political donations and a political culture in which "the chemical industry writes its own rules" is self-evidently corrupt and/or non-sensical.