That's a fair question. I believe Raiders was also tweaked in its DVD/blu releases to remove a rather visible glass pane between Ford and a snake in the Well of Souls, and there weren't any protests over that, either.
I consider this a "you might as well change it if you can" kind of thing, but I think changing how the DeLorean flew by CGI to erase the flaws also defeats the point: it was quite charming - and it took a lot of work - to use all kinds of techniques to make it fly back then. If it was made today CGI would solve everything, but there's no innovation for that. I think it's awesome that we can see how they did it now, no changes, and see how he was able to combine these things to make an effective film.