Two weak links in a permanent or long-term rig point have essentially been eliminated. Fortunately, it is somewhat protected by being surrounded by rock and covered by the O-ring and hanger. Some cavers fill the inside of the anchor with petroleum jelly from a small squeeze tube to help exclude water and reduce rusting. The pricing of all these items was done for large quantities. This is the same as, or less than, the cost of using a Petzl anchor, Petzl hanger, and a carabiner.
All anchors have advantages and disadvantages.
By using them you are accepting risk of lowered strength and reliability. But on the other hand they are easier than 10mm to drill, and the drivers are available. Installation and maintenance Plan your anchors carefully. Visualize what it will be like to get on and off rope. Have your companions critique the possible locations.