As a Roblox developer, it is currently impossible to make plugins that copy strings to the user’s clipboard. To make copy-able text, we have to show a TextBox, focus it, select the text, and then ask the user to copy it themselves.
If Roblox is able to address this issue, it would improve my development experience because I could make plugins that copy text to the clipboard for pasting elsewhere, such as asset IDs that can be pasted in the Properties widget, or other types of output strings like code snippets that could be pasted into scripts.