Looks like we are arguing but not disagreeing much.
I do agree that looking forward, a mirrorless setup is a smarter choice, because DSLR will be pushed out by it eventually.
I disagree that a Sony A7 setup is good for a starter kit. As a dedicated Nikon shooter for 45 years, I have started shooting with A7rii, because of its amazing resolution and ability to accept Leica lenses. I love it now. But I tell ya, it was not fun getting to learn it. Not intuitive, complicated, uncomfortable, clumsy etc. A simple straightforward D750 is a much better and easier to learn starting point.