Thanks for the reply. I don't use a blood knot when I'm tying lines or flies. For nail knots, I use the "Tie-fast" tool, which vastly improved the quality and ease of tying these knots, at least for me.
I believe that wind knots or tangles can come from other factors than poor casting technique. For example, if you're drifting a nymph and you get hung up on rocks, the tippet, leader, and line are moving at different speeds in the current, and this can cause knots & tangles. I guess I just prefer the security knowing that everything is securely fastened together.