The X11 that Apple provided with OS X was nothing but a snapshot of whatever XQuartz version was current when that version of OS X went GM. In other words, we are now getting the exact same product, but with more timely updates. It takes a special brand of cluelessness to see that as a bad thing.
It's a good thing. X11 has joined Flash and Java in the ranks of "stuff third parties maintain".
RSS removal is a different animal. Statistically speaking, no one used it (except you and me of course) but 10 minutes of app shopping and I've got a better solution running. Much better.