So, I just tried the 2017 keyboard. Let me say straight away, that if I didn't pay specific attention to the difference, I would never noticed the difference between 2016 and 2017. However, I did - so there is a very slight difference. The 2017 has just slightly more muted keys than 2016. Honestly, I like this a bit less, but that's a thing of personal preference. Either way, it's really, really close.
Now, I don't know about reliability. As for the 'feel' of the keyboard, it is so close that I am now confident that those who claim how they "hated" the 2016 keyboard but "love" the 2017 keyboard are grossly overreacting. Either that, or their 2016 keyboards were faulty. But mostly, I think it's just placebo in effect.
The difference is very, very, very subtle. The key wobble is the same, the travel is exactly the same, the loudness is the same, there is just a slight, small difference when you click, and even that is barely noticeable.
Now, if anyone thinks I am biased or something, well, that is your right to think so. I can only tell you this is my honest opinion, and that I am very sensitive to small differences and details. These two keyboards are almost identical, if you pay real close attention you can kinda feel the difference but there is no way that you think one is cheap and other amazing, or that one gives you finger pains and other doesn't - if you're being objective.
My honest opinion is that this isn't a design change or improvement, this is just a side effect of slightly different manufacturing processes.
Feel free to disagree, this is my opinion.