When Mannion took the reins in the SF game, the radio guys mentioned that Mannion had to, among other things, get the ball "up and down."

One of those toss away comments, but this a very true part of winging the ball
Sean can muscle the ball through anything
It's the ability to find the right torque, elevation, and stall that can illustrate a QB's finesse.
With the upper tier of the pro QBs one does see the keen feel of that sort of play

From what I've read, and seen from the B&G, Govane threads is that the QB has some items on his "to do" list
Some of the issues that say, Mannion, is suffering from certainly aren't the ones that Goff has on his list.