I don't know about all of you, I don't like these new flat icons that everyone is using. What ever happened to the old icons, like on iPhone and Samsung they used to have them years ago. Those were good times. Now it is always these stupid boring cartoonish designed icons. Side note: Somebody please update this icon pack. I am trying to use it on xfce on arch but some of the icons aren't working properly because it hasn't been updated in a while. I'll donate to you right away if you do it. Link to the repo: https://github.com/madmaxms/iconpack-obsidian
Yeh the files being little pieces of paper, and the folders being old office folios are skeumorphic. Skeumorphic was (or is?) sometimes used more generically for ui elements made to look physical so perhaps the pseudo 3D shading, dropshadows, bevels and highlights qualify much of OPs examples, though they aren't representing any specific type of physical object necessarily. Just objects to be grabbed and used (clicked).
I’m sure trends will bring us back to a similar style at some point like they often do.
it's weird that. it's obviously possible to have a flat-shaded skeuomorph, just look at basically all of windows 95, but for some reason we connect them to this particular graphical style. files and folders are both part of the old classic "desktop metaphor", so they basically have to be skeuomorphs. but like, the application icons are basically just mosaic tiles of the normal icons.
a proper skeuomorph would indicate what the program is for. krita and whatever map software that is are both good, if a little flat. but the libreoffice suite just being squares with a letter on them? have them be like, a spreadsheet for calc, a stack of cards for impress, and a printed page for write.
remember all the icons for windows 95 network utilities that have people in them? those are also (attempts at) skeumorphs because they're trying to communicate what the program does.