That is why it was abandoned. A few climbers actually claim leaving bolts in holes establishes a higher ethical ground. This baffles me. Not surprisingly, I've never heard anyone even attempt to directly qualify that opinion. RB anchor routes leave climbing areas in a less altered state than leaving fixed gear behind.
Some people argue that drilled holes get filled with dirt and become unusable.
Like cracks, drilled holes do get dirt in them sometimes. But if small cracks or holes are used to put anchors in they tend to stay cleaner from repeated use. They also tend to stay cleaner if dirty water does not often run down the side of the rock. Dirt tends to collect in holes that are drilled downward or low angled cracks if dirty water runs into them. Upward drilled holes or steep cracks don't collect dirt.