Does mac store important things in the downloads section

I was clearing out my downloads section in by Macbook pro after 2 years because it was insanely messy and because i always download like 5 copies of everything so it was super overcrowded. Anyways I deleted ALOT of stuff but it occurred to me after that maybe apple stores important stuff there. But then I thought maybe not because its so accessible to users and stuff and thats where all their downloads go so apple would probably put the important stuff elsewhere. Btw im talking about the downloads folder under favorites when you open preview. Anyways any thoughts?