Timers provide evidence of just how fast you really are accomplishing the task. Otherwise it is like lifting weights that do not have numbers on them ....it may "feel" heavy but you don't really know how heavy the weight is since it does not say so you are just guessing. Numbers stamped on weights and shooting with a timer allows you to know how strong or how fast you are and allows you to track progress.
Video provides evidence of what you are actually doing when you are performing a task (instead of what you THINK you are doing) and it then allows you to tweak your technique. It also filters out the liars and BSers because any one can say anything....but video doesn't lie ....unless you are one of the Instagram posers who speeds up his videos....
If you are not scoring and/or timing your practice sessions then you are just plinking.
Video provides evidence of what you are actually doing when you are performing a task (instead of what you THINK you are doing) and it then allows you to tweak your technique. It also filters out the liars and BSers because any one can say anything....but video doesn't lie ....unless you are one of the Instagram posers who speeds up his videos....
If you are not scoring and/or timing your practice sessions then you are just plinking.