My common exercise is to put tires on without the use of any tools or force, just by conscious manipulation of the tire and tube vs the rim. Yes, tools can make it faster, allowing you to take shortcuts, disregarding precision.
My common exercise is the same as yours....with most tires and rims. However, I have encountered a few tire/rim combinations that I defy you to install strictly by hand. For these cases, tools weren't a shortcut, they were a necessity and "precision" had nothing to do with it.