It's definitely not instruction, but I suspect it's been a neglected area in terms of drills and coaching. I've been saying it since last season that Saka and Martinelli will never be great goal scorers until they learn to score the Sterling tap ins, but they've never looked close to addressing it.
I've played with guys who you can scream at every single week to make a run into the box and every single week you'll seem them chilling in a deeper position on the edge. Others do it every time after you tell them once.
Some players will simply never learn, but I think our two are bright enough to do it. Saka's goal against Fulham was a good start and I actually thought we got players into the box well against Liverpool.