While they are very likely of "prevention of repair" on purpose (voiding your warranty, soldered stuff, yes I suppose sockets cost money and add thickness) and

While they are very likely of "prevention of repair" on purpose (voiding your warranty, soldered stuff, yes I suppose sockets cost money and add thickness) and "style obsolescence" (somewhat indirectly due to fast-moving mobile trends), I think that in general they do things which enable people to practically use their devices longer than other manufacturers (reasonable battery replacement, older devices still receiving OS updates up to 2 years after their release date, solid hardware compared to the competition). Planned obsolescence in these ways is not the same as "let's build it crappy / with known weaknesses so it breaks and people have to buy a new one". Mobile is super competitive, and part of Apple's brand is their [perceived] high[er than the competition] quality.