Vacuuming every day can cause the fiber batteries in carpets to wear out. However, dust, dirt, and everything else that gets trapped inside the carpet has a more significant deteriorating effect on the carpet. Secondly, can you vacuum too much? Believe it or not, the answer is no. Now, if you vacuumed continuously 24 hours a day, yes, it would be too much.
Vacuuming every day, or even a few times a day, isn't going to create any long-term problems. Removing greasy and non-oily dirt is so beneficial that it negates the effect of the brushes. The answer is yes, a mixer bar can damage a carpet, but only as a result of overuse or vacuuming. The damage caused by dirt and grime that settle on the carpet and destroy the fibers, as is the case with fine-grained sandpaper, is much worse.
If you use the vacuum properly and routinely, it's GOOD for the carpet, it's not harmful.