I quote from Apple https://developer.apple.com/design/human-interface-guideline...:
> Always make context menu items available in the main interface, too. […] In macOS, an app’s menu bar menus list all the app’s commands, including those in various context menus.
Therefore one can rightly conclude that there is no need for a key to bring up a context menu.
This reminds me of frequent conversations with other developers when presented with a bug report. "That's not a bug, it's working as intended." The intention is wrong, then -- the bug is in the design, not the code, but it's still a bug.
That used to be the case but has changed. Since at least macOS 15 the context menu key on typical keyboards is recognized and functions, and on other keyboards it can be opened with Ctrl+Return.
Apple's adding it to its own keyboards as well, at least on the third-generation Magic Keyboard with number pad (between F13 and forward delete).