I guess my question would be, why do you need the picture as a visual aid, is the accompanying body text confusing without that visual aid? and if so, by having no alt text, you accept that you will leave VI people confused and only sighted people will have the clarification needed.

If your including a picture of a table with nothing on it, there’s a reason, so yes, that alt text is perfectly reasonable.

Personally I wish there was a way to enable two types of alt text on images, for long and quick context.

Because I understand your concern about unnecessary detail, if I’m in a rush “a table with nothing on it” will do for quicker context, but there are times when it’s appropriate to go much deeper, “a picture of a hard wood rustic coffee table, taken from a high angle, natural sunlight, there are no objects on the table.”