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I am confused. I tried it with glxgears and it appears to work. It even prints its output (and reading it into the buffer works as well). So what do you mean when you say that it does not support running external programs with a UI?

I meant a text UI, something like lf or ranger that displays a TUI. The nvim terminal does not work 100% for that use case.

In vim I can just run lf to select a file and then return to vim.

How come I can run

!evince filename.pdf

when editing latex files in nvim after compiling?

And, but that does not defeat your point, :term shoots up a terminal in both under Linux.

Yes it does, just not interactively.