There’s plenty of criticisms to be made against Apple, iOS, etc, but “the only good thing” is a super generic and reductive statement. Proper sandboxing, app review by humans for people just hitting “install” the A chips leading to the M chips which are forcing competition, are all good things, and there’s more. Apple is overpriced, molds the market, fights against being a monopoly, takes advantage of international supply chains and people, that’s where they deserve the most criticism rather than their engineering specifically which has caused a bunch of really good tech things, not perfect, and not binary