Plenty of decent games on Android, but the experience of platforms like Google Play, Itchio and Humble Bundle is abysmal. Google Play pushes this slopfest iirc since Android 2 at least. Itchio has too much noise and too little browsing filters. Humble Bundle you'd be lucky to find a game with a notice that is too old and likely won't work on modern devices, the rest being kinda just there, forgotten.

For me at least, the best you can get out of a phone is emulation and source ports. But without a dedicated controller, experience can be rather cumbersome while playing too. In fact, a small tangent to show the point, the ebook reader I most prefer is a PS Vita homebrew simply because it is made to use physical controllers and works fantastic at that while not having to have the fingers cover parts of the page, even if the reader itself may take literal seconds to load the next page.

But besides that, I also miss the novelty of a portable console, or even from any consoles before they became somewhat standardized glorified boxes. The absolute unit that is the Saturn, the (truly) slim PS2 and the PSP whose loudness helps greatly at troubleshooting while their libraries do the most for their hardwares' quirkiness, the DS, 3DS and Wii having multiple screens for reasons, whatever Sony was going for with the PS Vita but that worked out fantastic (plus it was still relatively small)...

Meanwhile, the Switch and NS2 are rather basic, clinging to brand name, some exclusives, and barely having competition. But things like positioning them on a degree to play I can do with any no-brand screen, general library there are those portable Linux devices and stretching a bit the Raspberry Pi, and so on, and tinkering with these devices, not being as standard, brings some of the novelty back.

Besides, back at the initial point, I've seen console-like PCs a bit smaller than a Vita, like the R36S, making for a nice portable and pocketable experience. Though these are from my experience just powerful enough for retrogaming, which would lock you out past a certain point in time. So at least for now, I think those handheld PCs should do as replacement, but I would for sure gaming hardware to go back to that more novel and pocketable way.