“I feel that if we would cherish the mitzvah, we would “upgrade” them more often….You may disagree, its just my opinion.”
I dod disagree. Here is another perspective: People become attached to their Tefillin we wear them day in and day out, when going on a trip it is the one thing we always make sure we have there is a certain chavivus that develops (or should develop). Dito for a tallis tha is worn day in and day out as we serve the Ribbon shelo olam. This is why it is the generally the weekday talis (worn more often and usually for longer time) that is used to wrap a nifter which he “wears” in the olam haemes after having worn it for years in this world.
They should not be merely upgraded and discarded (obviously in a proper manner) for no good reason.
OBviously if they are no longer kosher, or only kosher bedieved that is another story. But I think there is something beautiful about a well worn tallis, and there is no reason to “upgrade” it.