This is a user-to-user support community. With the exception of the Apple hosts that manage, and maintain this website, all assistance that you receive is from international volunteers, not Apple employees. So you are not critiquing Apple employees here for their customer support commitment. There are community guidelines about conduct though, and some stray — thinking they are on Twitter, instead of a helping nature.
Apple continues to use the same clipboard functionality as in their beginning. It is a single-level, unordered, garbage in (copy), garbage out (paste) scheme. Any new copy to the clipboard replaces the previous content, with unlimited paste from the current clipboard contents between the Finder, and any applications that support the Apple clipboard, and its current data format on it.
The Terminal has the pbcopy, and pbpaste utilities that also access the clipboard. There are third-party clipboard utilities in the Mac App Store that offer extended clipboard features.