I've recently been convinced of the merits of removing title attributes from links, so this was a welcome change (or rather, it didn't bother me in the least). The one thing I'm curious about is, if this was done partly in the name of accessibility, then why was the "Open link in a new window/tab" checkbox left there? Opening links in a new window isn't accessible for anyone, so I'm surprised this was overlooked... Since it seems like WordPress 4.3 will be focusing a lot on improving accessbility, I wonder if this is another change we can expect fairly soon...