Calling (interactive) when choice is nil

I've written this function to modify the value of a global variable,=20
making it usable both interactively and programmatically in Elisp=20
code.  When choice is nil, the function prompts the user interactively=20
to select a value. If choice is provided, it sets the variable=20
directly based on that value.

Is it generally a good idea to call (interactive) when choice is nil?
(defun xia-dedicated-display-set (&optional choice)
  ""
  (interactive)
  (let ((selection (or choice
                       (completing-read "Display: "
                         '("new-window" "new-frame" "reuse") nil t))))
    (setq xia-dedicated-display (intern selection))
    (message "xia-dedicated-display set to: %s" xia-dedicated-display)))