I would much rather pay more to a Sweden-/Europe-style system and feel like I was actually getting something for my taxes, vs. the current state in the US where I only feel like a small fraction of my tax bill actually goes toward expenditures I think are reasonable. And to top it off, this year my tax bill is going to an administration that actively hurts people I care about with its policies. Gross.
I'm saying I in my current living situation feel I benefit from a lower tax burden and higher base salary more than ease of filing taxes would. In a few years that might not even hold true, and me benefiting more from the former doesn't mean I'm against the latter, they're tangential issues that happen to have a correlation in the US vs much of Europe (but obviously lack causation)
And to your point about reasonable expenditures, simpler tax structure won't suddenly change how the US government would spend money...
Obviously given the choice of a comparable tax burden and simplified returns I'd take it, but I find that for the most part once your taxes are so complicated you have to pay someone to do your taxes, you still won't ever pay anything even remotely high enough to close the gap between what your tax burden in a country like Sweden would be and what it is here