I basically agree with your points. A multitool is for occasional use. When you really have an extensive job, you need to get real tools. Over the years, my multititool, usually a Wave, has saved me a lot of time and effort, and averted at least one potentially disastrous situation (clearing entangled rope from a fouled prop on a dinghy that was drifting into rocks). I don't mind the weight of a Wave in normal everyday use. I do consider a lighter tool (I also have a Kick) if I am hiking and overall weight becomes more significant. The pliers are the most useful tool on the multitool. I switched to Leatherman tools in 1985 when I saw my first PST, giving up the SAK that I had been carrying before then.
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Geezer in Chief