All that is true, but IMO it will be pretty meaningless in the big picture. All that stuff is pretty small potatoes for the system as a whole. Those forms will still need to be prepared by all the lenders, tax offices, charities, etc. so there is no efficiency gain at all on the 'provider' side. Every single form prepared now has to be prepared and mailed under the new law. What it does is save taxpayers a very small amount of time by no longer having to track that stuff. OK. Fair enough. If it ended there, I'd agree that the tax system was simplified - not much but some!
But the problem is the real complexity, where all those hours and $billions in time and money get spent is really on everything BUT Schedule A - itemized deductions. It's on compiling business records, then dealing with the tax law about business activity, and the fact is the new rules INCREASE complexity there - or likely will depending on what is in the final package. The pass through stuff creates another type of income that is taxed at preferential rates, so tax people will spend a lot of time figuring out how to deal with that - just by itself, because of the rules to prevent "abuse" and converting salary to 'pass through' income. And the big issues will be in how to convert ordinary income into both lower taxed C corp income and hopefully double up and get some income subject to lower pass-through rates, then the lower corporate rate. All that will require complex rules to prevent "abuse" which adds to system complexity, likely substantially!
And then there's the issue of reasonable compensation. If salary is taxed at 37% but pass through income at 30%, or corporate income plus dividend taxes at 30%, then every business owner wants $0.00 in salary! But IRS will require it and now tax people have to figure out what is the minimum amount of salary to pay the owner of a company. Who knows?