My experiences...I don't care a wit for them. Today I replaced the oil flippy on a 260. I believe this is the fourth in 8 yrs +-. Doesn't sound like much, but compare it to a screw in cap that would probably still be original issue.
Am I breaking them? I don't think so.
And your perception of those that don't like them, I think, is wrong. I bet you those 7 people you mentioned and myself being no. 8, are actually bright enough to "figure out how to use them" Oh yeah, I had to scratch my head a bit and cy-fer it out, but I think that by Gwaud, I mastered it.
I have had them break, and I have had them, like the one today, just become a nasty, obsessive, little critter, that would seal - IF - you could get it to turn in correctly. (Yes, I is a-where of the swivel screwing up.) So, since it musta been the reason that I have not slept well in years, I de-duced that I would be better off changing it. See...I has smarts.
I would snap up some kinda conversion to the old type caps. I do think it would serve two purposes, one being the topic on discussion, and the second - since it would raise the actually cap up a little - perhaps it would make it much easier to clean off around the cap before opening.
I have 4 Stihls at present, and usually have to take pains to keep the crap outta the tanks. And no, I do not obsess about the crap, just the cap.