Just games tbh - Cunt be fucked with the load times. Nothing mission critical. Good idea about the M.2 but like you say, 4GB isn't gonna be realistic in that form. My OS however is on a 500GB Samsung M.2 so all is good
I know its overkill, but I'm just future proofing - For example I've got another 16gb of DDR4 ram coming too. I've got 16 already which is more than enough for any of today's games, but it will save me having to find a matching pair of sticks in say 3 years time, when 16GB is no longer enough for games...