I completely agree with you about everything you said but I stand by what I said about it not being a waste or useless, it's a convenience and one I enjoy having for the reasons I previously mentioned and a few others, if you don't want one for yourself to each his own but to say it's a waste is where we disagree.It's really easy to tell. You let off the clutch and if the bike doesn't move, you're not in first. Once you learn to listen to what the bike is telling you, you don't need fancy indicators. You can make sure you don't find yourself in such a situation by habitually down shifting into first, while coming to a stop. Just like they teach in the Basic Rider Course.
Not that it really matters but have you ridden a bike with one and then found you disliked it, I'd be intrested to know why or do you have no first hand experience and you just find the idea to be an unnecessary one having never experienced the convenience.