Yes, the Joe Wright one with Keira Knightley and Matthew McFadyen deleted Mrs Hurst, the married Bingley sister.
I suppose you can see why if you're trying to slim down a novel with lots of characters to fit into a feature film length (when the adaptation the viewing audience was most familiar with was a multi-part TV series which had much more leisure to be faithful to the novel) -- the advantage, too, is that rather than Caroline Bingley bitching about the awful Bennets to Mrs Hurst, she bitches to Darcy in this version, which brings his snobbery sooner to the foreground?
I think Maria Lucas isn't in that adaptation either?
It's true though, that 'taking advice from a sensible friend' or 'going out and moaning to your gang before taking any action' would totally wreck the plots of a certain type of fiction, just as having mobile phones would resolve key plot points of many films before they even got off the ground!
And insufficiently differentiated characters is a real pain. I'm an alert reader, but Kate Atkinson's Transcription just didn't work for me because of the preponderance of essentially similar besuited Englishmen called Godfrey, Perry, Oliver etc, whom I was never sure I could tell apart.