smsnyder...I only use sink tips when fishing moving water - rivers and streams. I never use split shot because I truly value my rods and don't want to ruin them on the chance a cast goes awry and I hit the rod with it. Further, in the lake fisheries that I fish, they are fly fishing only and split shot are not lawful. When fishing lakes I use sinking lines of intermediate, #2, #4, and #7, all on separate reels, and typically on separate rods determined beforehand, in that I have one rod with a floater and another with a sinker while carrying a spare reel with a third choice.
As mentioned, above, I don't use split shot - ever. I use sinking lines in lakes in various sink rates. When lake fishing, I want as straight a line as possible, and I usually get it with full sink, compensated lines. The exception being when fishing with indicators and chironomids, when I strictly use a floater and weighted nymph when and where necessary.
And in rivers and streams I use sink tips of various weights. In this moving water, I rue the times in the past when I would get hung up on the rocks with the full sinking lines wrapped around obstacles. This I found was far less common when using tips.
Jet sleds/boats destroy redds in the spawning grounds with their turbulent jet wash, scouring the bottom and further burying some of the eggs while ejecting the rest into the stream flow to be eaten. To protect fish, these boats must be restricted from the spawning grounds.