Actually, no. If the timing had been politically expedient it wouldn't have run into the election and halted the cases. They would have been done and dusted a year ago. The timing was considerably slower than necessary precisely because the DOJ process is a. very cumbersome with a zillion checks and balances and b. the administration was reluctant to do anything that would appear politicised to the point they allowed the statute of limitations to lapse on the fairly evident fact he illegally took £10m from Egypt.
The Willis, Bragg and NYS civil cases cases may have had more of an element of politics, but the grand jury process in these kinds of cases functions extremely efficiently at weeding out politically motivated prosecution as does a jury trial. (worth remembering that his legal team waived their right to a jury trial in the NYS civil case). The legal process is certainly flawed, and abuses absolutely happen - in all honesty, not generally to wealthy white people - but it's also pretty efficiently structured to be very protective of defendants and wrongful conviction.