I own a Steam Deck too and I can’t see a Full HD display being necessary at this form factor/display size. 1280x800 is a bit small, yes, but I really want someone to try 1600x1000 which I theoretically consider the sweet spot if you have slightly beefier graphics to support it. Also FreeSync or something similar would be cool imo.
16GB is just enough. According to a guy who modded his Deck to have 32GB RAM it only reduced stutters in AAA games, but at least 24 GB would be a nice have to be future proof. Keep in mind that the 16GB also hold video memory and games are getting hungrier for VRAM.
RGB lights anywhere are just an unnecessary gimmick. This is but a personal opinion and comes down to preference and taste.
No need to burn it down it’s gonna crumble on its own.