How is vitakka / vicara a "fruit" of concentration?

I have issues with the exact meaning of vitakka/vicara. I'm familiar with the stock translation "initial and sustained application of attention" and the images of vitakka and vicara being like a gong with initial strike vs. resounding and the bee visiting a flower and than buzzing around. My meditation teacher mentioned that "vitakka and vicara have an aspect of 'fruit'". That makes a lot of sense to me, because otherwise they wouldn't be listed as jhana factors. So there have to be multiple layers of vitakka and vicara, probably depending on the level of concentration? I didn't find any good references for it, can you help me? In terms of meditation experience, I always assumed that there is just one v/v. How would you describe the difference between normal consciousness v/v and the improved version of v/v in access concentration or 1st jhana?