My 2011 MBP's keys were solid. Had a great feel to them and I never had an issue with keys failing or becoming stuck. I even had a few incidents where I spilled a beer on my keyboard and it was completely fine afterwards.

I now have a 2017 MBP and I hate these keys. The H is always sticking (no spills even) and the keys don't have that nice soft feel to them. I've interrupted a meeting or two with how loud this keyboard is as well... Definitely a step in the wrong direction IMO