Is there an additional charge for exterior plaster with a broom stroke texture?

How do you come up with "dents"? The base plaster must be proper, otherwise you see every "dent" with the broom finish just as much as with the textured plaster. I believe in this regard you have no advantage with the broom finish.

Unfortunately, you often see "dents" on especially larger facades when there is side lighting.

This is because [Mauern] and [Verputzen] are crafts and not industrial products. If you do not want to see any unevenness in the grazing light of midday or evening sun, you have to pay a lot for the extra quality.

I even believe that Besentrich would actually emphasize dents. You then have lines that are supposed to be straight and more shadows. If you want to conceal, you should rather use the Altdeutsche Putz from above. Or else my Naturstein-Optik.

You can unfortunately often see "dimples" especially on larger facades when the light hits from the side.

Exactly, and these become even more pronounced with the broom finish because nothing can be smoothed out with the top coat anymore. And especially on large surfaces, you can also see the spots where the "broom" is reapplied very clearly...