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I Asked AI to Count My Carbs 27,000 Times. It Couldn’t Give Me the Same Answer Twice.
(www.diabettech.com)
This is a most excellent place for technology news and articles.
To your point -
If a friend texted me the same picture and question, I would do exactly what you described. Try to give a calculated guess that wouldn't change.
Unless I was lazy and Googled it.
Google's carbohydrate tool says 8g, then the AI overview goes on to contradict that by saying "A standard cheese sandwich typically contains between 25 and 35g."