It's not the shoulders you have to worry about as it sinks between knife/spoonfuls. I'll give you that though, it's not easy to get the remnants out of the bottom of the jar.
I follow my mum's tip though. When it's virtually empty, a tiny bit of hot water in the jar, give it a shake and add it to mince for shepherds pie or to a stew. Acts exactly like adding a beef/oxo stock cube and no waste.
I'm not saying she was tight but.....