The reliability of the chuck has nothing to do with the tool offset setting and it is not necessary to reset every time you use the machine.
If leave the tools in the turret you can leave the X offsets unchanged unless you change an insert in which case it is a good idea to re-check. As ulrarrun27 suggests you can do this most easily by adding a small amount to make the parts oversize then go back down after measuring them.
For the Z offsets if tools are left in the toolchanger (if you have one) but will not be used I think it is a good practice to set them back several inches away from the chuck so you are less likely to index the turret and crash them.
An open mind is a virtue...so long as all the common sense has not leaked out.