More Trolling ??

[Jmorfish]

I just bought some new P-Line fluorocarbon to replace on my 4 trolling reels...doing the job as usual, then I thought to myself...do I really need to put on that 5 or 6' leader line after I get the new main line installed?? been doing this ever since I started trolling, like the leader line for fly fishing...but is it really a benefit on trolling rigs? I'd been using a swivel to connect, so that would be 1 or 2 less knots to keep checking..in your opinion/experience, is that leader line necessary?