Actually there are a WHOLE BUNCH of "Mini-PC" available on the 'cheap' that may have AMD 780M worse/better iGPU's & USB4/TB3/4 and/or OcuLink ports built in.
While the systems above COULD give the buyer 'SteamDeck' like performance but with the addition of a ~$99USD eGPU dock < $100USD PSU AND AMD (or Intel) Desktop GPU card the buyer CAN EASILY put together a decent Gaming Rig for < $900USD.
If one were to watch the sales/discounts and/or shop the 'renewed' and/or not so current generation offerings even GREATER SAVINGS can be had.
ETA Prime has put the Minisforum X1 Lite Mini PC with the Ryzen 7 255 and 32 GB of LPDDR5 RAM and the OneXGPU 2 eGPU dock through its paces in AAA games. The results are super positive, as the AMD Radeon RX 7800M-powered OneXGPU 2 provides enough horsepower to run AAA games at 1440p.