Well you can save your tune as a project and it will automatically open both the tune and the template.
I don't know what Chris' reason is but I imagine you can edit different years differently by using certain templates to see if something is missing in the hex code.
I haven't really tried with Sniper yet, but you can edit old Lightning files with new templates with CMR.
I'm curious as well, I'm fine with it. It forces me to match the correct template with the correct pcm file which the other two programs often do incorrectly.
Sniper Delta Force Tuner and Dealer