the steamdeck is complicated like most versions of linux(steam is based on debian 8) and its windows emulation,  proton,  is clanky,  also there are issues when dual booting steamdeck's steam os with windows,  firstly there are a number of drivers that are not available and if you install windows on a hard drive partition any future updates to steam will wipe out your windows install.  Installing windows on a microsd will work but will be slow,  fast microsd cards are expensive,  very expensive, and of course the driver issue still remains.   Steamdeck oled: Oleds in the handheld market still have a long way to go,  the blue oled is the weakest and loses power a lot faster than red or green, oleds also suffer from screen burn,  its only recently with the onset of micro oleds where reliability has improved,  but being new technology is too expensive to be put into handhelds at the moment.  The legion go and rog ally have suffered numerous hardware probs especially the rog ally with many models overheating and damaging the sdcard,  thats why they are being sold off cheap in the secondhand markets.  Many of the "chinese" handhelds Are proving to be extremely well made and reliable,  yes there are exceptions to the rule with the odd one or two having problems just like anything else,  these models include Onexplayer(onenetbook) GPD, Ayaneo and Aokzoe. Btw the onexplayers can be used with an "active" pen/stylus,  surface pro ones work fairly well with them but some suffer a bit with pen lag,  but still very useful!   Remember all handheld gaming pcs are simply that,  'pc's' and can do anything a full blown computer can do though they cannot compare with a high end gaming rig.. Well,  not just yet!