It's not my intention to complicate the issue but, if it's thought about and agreed at this stage, then people might be able to avoid unnecessary scenic issues and problems with track layouts where they're trying to avoid board joints that could just be a short distance away in what is a more convenient place for them to be.
If it's going to be an end-to-end run, then people could make whatever length suits them, depending upon their home situation, vehicle dimensions, etc..
Feel free to carry on how you like, just my tuppenceworth.