Thanks Box. I actually had found that thread and read it already. It clarified a few things, but didn’t really make me feel like I understood it enough to go one way or the other.
Developing features in software isn’t cheap and easy so there must have been some good reasons why it was included in the first place and still exists in SU21.
I looked through the SU help site, searched the community and the web in general. SU didn’t really explain any reasons for or against using it. Just explained how to use it. The web in general seems to agree with you.
Length Snapping can be useful if you are using SketchUp for sketching where precise dimensions aren’t critical. It can make for faster sketching but as you’ve seen, it can lead to imprecise models when real dimensions are important.