In terms of external displays i believe you wont have a problem with them considering on the x you could hook up a (standard usb 4) egpu and even on the non x with a dock you can get a 4k60 display (depending on the dock and maybe even freesync) I don’t think the cpu performance is the limit (it performs on par with a i9 4 generations behind but with 30W), nor the ram (windows paging is what makes win11 usable on that when gaming), although battery life on my z1e ally (non x) is awful but when plugged in that won’t matter. What I am concerned about is longevity of the hardware, its not like a standard laptop where the ram is socketed, the wifi card is socketrd (which I HATE, please do put that in mind this is a mediatek wifi card which isn’t replacable and has latencies that spike so bad for absolutely no reason and it makes remote desktop unbearable) although you can always plug in a usb to ethernet NIC on that hyptothetical dock youd be using it on

The amount of memory that is dedicated to the iGPU can be changed (at least on the normal ally non x) It’s a range from basically none (auto) to 8GB on my normal ally

Apart from screen mirroring and sms that everyone has mentioned the proprietary alternative undeniably has more features. I don’t know whether it is phone link or link to windows but one of them has a feature where your phone can be used as a webcam over WiFi. As someone who set up ip webcam on my phone and used obs virtual camera through most of the pandemic’s online classes it’s quite useful and I’d like to see features like that just work and are not relying on mjpeg and proprietary software on the phone end. Their auto hotspot feature i haven’t gotten to work and i think is useless but I’m thankful that i don’t have to turn off kde connect when using samsung dex.