It's going to be very important as a teacher to get a student to understand that in golf few things are ever singular and fewer things are ever permanent. A lot of players think "I paid $30 to have my clubs lie lofted now they are good.” That is singular and will be painful until you figure that out.
A mentor once laughed at me as I made some comment like "I had this club bent so now it should be fine". He went on to tell me that good players understand their tools and that they have a relationship with them that is always changing. He said that he “was lucky to be married to such a great woman for 40 years”…..and asked "what would have happened if I put in some effort on the first date (akin to bending a club) and then for years after didn't put any more effort in?" Do you think I would still be married and have those beautiful kids? NO WAY. He told me that my clubs are the same way.
If this is too much for you that's fine, but don't ache if a friend gets better and better and you never move off 86.
As an example let's say you get your Driver impact willingness tuned (real MOI). You hit it leagues better. The mistake is to think that this is singular and permanent. Big mistake. Lets say you take a driving for distance series and gain a smooth 10 mph and lower spin by 800 revs. 25 yards! Success right? Almost. Now you will likely be hooking the Driver as the impact tuning will need to be reset for the extra speed.
Back and forth, this is how it will always be but you will always be improving.