The advantage of using a by-pass pruner lopper on 1-3/4 inch diameter branches or less is that these smaller branches tend to wag like a dogs tail when using a saw blade. This causes a rough cut, potentially damages the tree and takes extra effort. The by-pass blade cuts the branch "clean" reducing tree damage.
Steve, Just today, I had an opportunity to use your saw for the first time. I was very impressed! Wow! I have used the trimmer a number of times and it works great. But the saw makes such a difference. Thanks for selling a great product. Walt Fielding