I feel like with sleep mode on the DS, PSP and later handhelds that became mostly moot anyways. There are still great OG Game Boy games I probably wouldn't want to play in the grocery store line (e.g., Link's Awakening) but with sleep mode it doesn't really matter. You just stop whenever, pick up whenever. Arguably the PSP suffered from not going all in on console style gaming with just a single analog stick. SO many games on there suffered from that.

The PSP was definitely more complicated, and perhaps more fragile but it felt incredibly futuristic in early 2005. Graphics basically as good as my home PS2, you could watch really high quality movies, music on the go, browse the web.