I think that was an anomaly. The e series is mostly just a pretty version of the base sw1911. No slop and I carry mine a lot.
The E-series got a big boost in reliability in higher round counts due to the larger extractor, but you're right, outside of that it's fluff. Hilton Yam describes the older extractor problems in detail.
As far as being an anomaly, it doesn't seem so. EVERY S&W E-series seems to have a crappy fitted grip safety, all one has to do is google or post pics. That's not a deal killer for me as it doesn't compromise function but you'd think they'd put in a little more effort into for $800+ guns. I was actually willing to live with this recently because I think the S&W E-series 108482 is a good deal. Every one I picked up..... and that was a total of 3.... had a VERY sloppy thumb safety fit. No positive engagement whatsoever. Easy fix, and I'd probably rather have a different TS anyways but it shouldn't come from the factory like that.