Of course, "little" is relative.
At least three times now, I've made changes on a timeline which were not reflected in a render.
Meaning, I go to the timeline, make a change, render, and then the rendered file is as though I never made the change.
There was no prerendering involved.
Twice it occurred as part of a batch render, the kicker being that some of the resulting files reflected changes that were made, and some did not.
And these weren't minor changes; these were instances where five seconds or more were removed and it rendered with those seconds still in the footage.
Nothing like that ever happened with earlier versions. (True, Vegas 4 did like to toss in random frames from other sections of the timeline now and then, but I haven't seen that for some time.)