Why use a template........

As some of you probably know I have decided to use a different profile the the one I originally cut the temlate for.
I am kind of wondering why bother with another template? I cannot seem to come up with a good reason to make the template first, then use it to cut two more sides, why not just cut the first side, true it up and then use that to guide the router with the pattern bit??
The first one was only 8 feet long so not that much of a deal, but for this one I would have to splice on another 18 inches for the the template. Seems that cutting two sides would be quicker and easier than 3.....
Steve..????.....Anybody???.... What am I missing here.?
I am kind of wondering why bother with another template? I cannot seem to come up with a good reason to make the template first, then use it to cut two more sides, why not just cut the first side, true it up and then use that to guide the router with the pattern bit??
The first one was only 8 feet long so not that much of a deal, but for this one I would have to splice on another 18 inches for the the template. Seems that cutting two sides would be quicker and easier than 3.....

Steve..????.....Anybody???.... What am I missing here.?