I do agree with you, Jainen, about the campaign promises, And somewhat about the voting record, although I do think that the record, over time, does show me a lot about where he will compromise, and where he will stand his ground.
As for the tax returns, there are only a few things I get from them. While it is interesting to see where the income comes from, and may give some insight into why he votes the way he does on some things, I don't think it tells me much more than that. National pols are going to use professionals to do their returns, and often to manage their investments as well, so I don't pay much attention to that. The Sch A I find interesting because of the personal lifestyle information it shows.
Personally, I doubt that any successful individual pays that much attention to the DETAILS of their tax returns. they leave that to the professionals. And given the way our government wastes money, if they try as hard as possible to legally reduce how much they pay, I respect that decision.