Interesting to hear that an R13 purchased in 2016 would STILL have keyboard problems... Did you get an R7-371T or the newer 372 model? The latter had a redesigned keyboard so I'd think they would have fixed it.
For my part, after I sent mine in for repair it's WAY better. Still the odd missed stroke but overall a real ipmrovement. For me it's just down to the lousy screen retention issue which was dubbed "not an issue" by Acer, so they wouldn't replace it.
Mark