Yeach windows has problems but stability is definietly not one of them. Likewise linux has problems but in fact it is not harder to use ( in fact it is so easy to use that it is reasonably popular to put some easy distro in some forsaken by time laptop instead of windows for pepole who use browser and literaly nothing else ). Frankly speaking most pepole just dont give enough f about their system. The best i can say about it is that pop os specificaly just looks better ( i am in the apparent minority of pepole that very much likes the looks of gnome ). The best way to populrize linux is to have it by deafult instead of windows on laptops and prebuilds but that will never really happen ( they make insane amount of money on Markup by having windows installed despite the fact that they get it for really really cheap. Its really apparent when you compare some laptops that can be bought without the os preinstalled )
Not really peaked. More like we entered the era of diminishing returns which btw is great if you are not blinded by the marketing. Mid to low range phones are fairly cheap and more than adequate for almost anything . Do you know how shit even mid range phones were 10+ years ago and how fast they were getting too old to be usable. Right now its more than reasonable to use any smartphone for a 3 to 5 years and probably even longer ( before only champions like samsung Galaxy note 4 could even hope to match that ). Everything you talk about is cheaper and more afforable than ever before( if you do the usual and not buy overpriced brands beacuse of a brand like apple , galaxy phone , roomba robot vacuums etc… ). The only thing thats a shitshow right now are websites and computer prices precisly beacuse right now the current hype is LLM( which makes graphic cards really f expensive and kinda hits website by ricoshet due to the negative LLM influence ).
Actually even as smartphones go there is a progress. Folding phones. Coincidently they are less relaiable and not as long lived . Exatcly as smartphones were 10 years ago.
Also smartphones were something much grander than a simple tech innovation. They were truly a society changing innovation like cars, trains , planes or a computer. They just peaked much faster than cars , trains or planes. In fact they probably had bigger impact on society than computers.