Yeah, I get you, but you're also running a business and you're not gonna sell a lot of copies of a release that's gonna get thrown into the ground by the fans for having a mediocre vocal performance (talking about JLB, of course).
Also, maybe we're taking it lil too far? I have watched fan-filmed performances of the two nights in London and JLB sounded as good as he possibly can in this day and age. I have no issues with them pitch correcting parts that felt off when they were not as bad as people point out they were. Fatal Tragedy was not so good, but boy he slayed in Beyond This Life (which is a much harder song to perform). It's not like they re-recorded the whole thing, so it's all good to me (yes, I'm deeply staring at the overly hyped Live at the Marquee right now).
It's all about balance, and I don't really think this has to do with being new or old fashioned; but just getting out the best product you can with the resources you have available.