Rob,
The simple answer to your question is “how far did your original designer of the golf course want them off the tee (and why)!” If you find out the answer to that question you will have your answer.
Carl and others,
There is always a “reason” to do or justify almost anything and it is no different when it comes to GCA. When we do a “Restoration” or a “restoration”, we for example put drainage in the bunkers (even though there was none originally there to start), if we replace trees they will likely be a different size maybe even a different type than what was originally planted, it is also likely any new grasses will be of a different variety as well as the choice of sand for the bunkers, cart paths might be added or removed depending on the course’s needs, fairway drainage and retention areas could be necessary due to surrounding off course development/hard scape that all now drains water onto the golf course requiring the water to be better managed, there might be original ponds on the course that are now used for irrigation (something else the original course likely didn’t have) that needs to be modified/maybe enlarged,… the list goes on and there is usually good “reason” for all of this.
We have debated what is and isn’t “Restortion/restoration” forever on this site and I have come to the point that there will never be complete agreement. If it is clear what an original architect intended for example for a bunker from a strategy standpoint and that intention is now gone or diminished, are you doing “Restoration or restoration” when you put it back exactly where it was? Did you “Restore/restore” what he or she originally designed? It is not always easy but I believe “Restoration” of a golf course is more than just restoring the physical aspects of the design.