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Then you may find yourself impeding getting a fellow diver to medical care. Or there may be a danger of which you are not aware.
If you're diving with an operation that has an in-water DM, a/he's part of your "team" and that signal is a command.
If you call a lamb's tail a leg, how many legs does a lamb have?
No, it is still 4. Just because you say it is so, does not make it true.
If the guide has not established such a protocol in the pre-dive briefing, then what you apparently expect just might not happen. Or it will take a bit more than a simple thumbs up from someone who is not my buddy to cause it to happen.