While I'd mostly agree with your 4 suggestions, I'd like to dovetail with the possible use cases.
#1 This is a PORTABLE device and as such, run time on battery is a PRIMARY feature. While tethering to power supplies (like in a car or RV) might be possible with ALL the available handhelds, having it as a requirement to get BOTH the performance and run time is a show stopper.
#2 With a TB4 or even the addition of a Oculink port, the ability to tether at home to a eGPU (with ports for more storage, wired networking, exc.) could not only 'future proof' the device with the possible ability to get better eGPU cards but could "super charge" the devices performance (both in details and FPS) in current and future AAA games.
While opinions are rather mixed on 'playing' with dialed down details and resolution to get 'playable' frame rates are all over the map. Some would rate the performance's as 'great' and 'outstanding' while others are frustrated with games that are barely playable. Sure they run but playable - not so much.