Yes, but that answer is wrong, because of a quirk about umbrellas themselves - Orthodox Jews don't use umbrellas on the Sabbath because opening an umbrella bear

Yes, but that answer is wrong, because of a quirk about umbrellas themselves - Orthodox Jews don't use umbrellas on the Sabbath because opening an umbrella bears some similarity to constructing one, and constructing things is forbidden for them on the Sabbath. (There are many, many footnotes that would be needed to give a full explanation; in short, Orthodox Jews don't use them, regardless of whether they actually believe they "should" be forbidden from first principles.)