I agree that we should have a simple tax --- and it could look like that, but it would also need Progressive taxation -- and perhaps no taxes on people below the Median income. There is no way to have a Democracy if you do not redistribute wealth -- a point that will become very clear to everyone if we allow our current pooling of money with the top .1%.
The other issue here is -- we have to do something about the jobs this would remove. If you think that "make work" is wrong and our society is all about efficiency -- then you probably have one of the few jobs that is essential. Teachers, builders, doctors -- those are some of the "must have" jobs. I worked in marketing doing multimedia -- I only have a job because there isn't one company providing the product (and thus efficiency). Competition does lead to better products -- but it's very wasteful, why have two or more companies? Advertising is a large expense -- and it produces nothing. It does not really inform, it merely drowns out mindshare of other companies.
The fact is that MOST employment is created by government regulation and artificial rules of the game -- like not having monopolies.
If there were no complex taxes -- you don't need all the accountants -- much less TurboTax. But you also lose a lot of other professionals involved in this process. If you have no pollution controls -- then you don't need scrubbers and technicians to build them. It's more efficient to have only trains and houses set up on a grid -- you don't need people to build and service cars.
So yes -- make taxes simpler and fairer -- but we also have to have ways for people to be employed and that requires government -- it's really sad that the people who propose free market everything don't notice the cesspools on this planet where there are no rules for the game.