I’m glad you would like to see it too Sam and I hope we’ll see it soon 
Another place where I think it would be incredibly handy is when viewing a post via the flag system - it would be nice that it either ignores you own personal position, or, whenever you click through to a specific post for and Topic it asks you on leaving whether you would like to retain your original position, or set the most recent portion. If it tells you which post you had previously see (and maybe all you to jump to it) along with the post you later came in to (perhaps via review queue or post link) I think that would be super useful 
The flag system is definitely a problem for me atm, as I am avoiding carrying out those duties as I don’t want to lose my own position in those topics. Pretty sure others probably feel similarly?