Look right, I can remember retro g*mers making jokes about the Game Gear being 2big and 2heavy back in the day, probably in the 2000s. Classic Game Room watchers remember. Same for the Lynx. The Wii U's tea tray controller was derided for being beeeeg. I can also recall people saying that the PS Vita was kinda large back when it came out, which tbf it is pushing the definition of "pocketable" for the boys and takes up a lot of purse space.
It sort of felt like reality broke down in 2017. The first thing I did when the Switch was announced was make a joke about putting a Game Gear in your pocket, but suddenly nobody else gave a damn that the Switch is like ten inches long. Most dildos are not that long.... I get that it's a hybrid, but suddenly the dynamic shifted from "if it can't fit my dude pockets it's no good!" to "aw yeah bruh just get a hardcase and throw it in a backpack!" I do support backpack gang, but you almost may as well get a laptop at that point.
Handheld size has become progressively more comical over the years though, with my favourite example being the Steam Deck which is actually considerably longer than a Wii U Gamepad at an XL 13" Tell ya what, I couldn't fit that!!
I'm not really against the existence of larger handhelds on its own, I have long fingers and a DS Lite or PS Vita will give me handcramps sometimes. But it's like a weirder version of when all phones became "phablets" and impossible to use with one hand, suddenly all handhelds are as big as the Wii U pad. (Switch Lite excluded, though it's still larger than a Vita) It also seems like the PS Vita and 3DS primed everyone to accept hilariously short battery life? The PSP 3000/Go and DS Lite/DSi could get anywhere from 8 to 20 hours depending on your settings, that was awesome. The 3DS and Vita won't hold out for more than three hours under duress, though. Most modern portable PCs have worse battery than that, even...
I guess I'm just wondering wha happun??? I know there's a large contingent of people who never take handhelds outside the house anyway (based) and just use them on the couch, but I don't think the Deck would be much more pleasant to handle in an armchair or whatever. That's one thicc-ass boi.
For smartphones I think a significant driver of their ever-increasing sizes is that battery technology is lagging behind power demand. The worst thing of having a small phone these days is that the battery lasts less than a day. Big screens used to be too power hungry to be practical but LEDs are extremely efficient these days.
My prediction is that we'll return to the miniaturization craze of the 1990s whenever the next breakthrough in battery technology happens.
I will say power demand is at least partly driven by constantly on tracking and advertising. Most of what I actually do on the phone could be done with an irc channel and text-only Web browser