I'm amazed so many think Baines is past it.. ignoring his vital goal, I guess some didn't notice a few great crosses either.. which was his primary contribution to being 'the best left back in Europe' for chance creation. And ignoring that he still gets the crosses in despite not having had a link man on the left for years now.. Set pieces got taken off him by Lukaku amongst others, although with Rooney and possibly Sig I doubt that will change.
Agree with Jimmy's point though, if he got injured we would be lacking there. Baines is one of those players who you don't realise is that important until he's missing and no-one is capable of the same level of cover. But then that's probably why every manager during his time (including RK) always has him as first choice when fit. Give him a proper link up on the left and he'd be back to banging in crosses and using the 'underlap'.