Either way can be a trade off. Connectors are failure points, but I know a lot of people that tend to wrap cables when they are not detachable which is hard on the solder points as well if wrapped too tightly. But this is mostly an issue for people that need to transport keyboard often to office, lan party, tournaments, etc. For those that leave thier keyboard on the desk 99% of time, I don't see how people manage to break thier usb connectors. I think those are user problem, not manufacturing problem.
I bring my Poker into the office each day, for months now and it gets unplugged and plugged in quite a lot. I always make sure to plug in the cable straight, and gently but securely. It has no sign of a problem so far.