For the record, PSP has to have been the most open device in Sony’s wacky proprietary history. It had the stupid UMD, and Sony’s flash cards (that was still used in tons of different devices, and crashed in price around the time PSP left the “early adopter” phase)… other than that, it didn’t force you to use shitty transfer software, you could charge using plain jane USB, it didn’t force you to convert mp3 to Sony’s useless Atrac. PSP actually proved to be a little too open, which is why Vita’s interface is so locked down and stupid. UMD ended up being a bad decision at a “stop gap” time where there weren’t cheap alternatives for large removable storage, but PSP is the worst excuse to dig up Sony’s proprietary track record.
I just think the dedicated handheld argument is a playground for speculation, fallacious arguments and mental gymnastics, because Nintendo is the only manufacturer that’s been successful at it, in every region, since Gameboy.
Game Gear had handheld-friendly games, but it failed in the end (still the best-selling handheld not from Sony/Nintendo). You can blame the battery life or viewing angle, or parrot “no must-have games” like Gamespot et al likes to say. Neo Geo Pocket was a little better at battery life and form factor. Still failed, you could say “no must have games.” PSP was on its way to irrelevance everywhere… until a console port saved it in one region… but overpriced, proprietary, piracy scene, other things that take place on Nintendo handhelds, caused PSP to fail. Or again, “no must-have games” or something. Then Nintendo claimed that console port exclusively for 3DS, and that game, that’s originally a console game, sells millions… on a Nintendo handheld.
Until a flagship Nintendo handheld gets outsold by a competitor, the common denominator for dedicated handheld success is Nintendo’s software, loyal base, and brand equity. Their handhelds have been riddled with ports, their online system isn’t intuitive, console-sized games sell in the millions. All those things that you claim were “mistakes” on Sony’s and other past handhelds or whatever it is you’re trying to say.
Sony has definitely made mistakes with their handhelds, but the only significant one is failing to advertise why Western audiences would need a handheld. Nintendo is running into this problem as well, but 3DS still sold okay (way less than DS, but it’s on par with GBA last time I checked)