I don't see them as a problem any more than any other fixed TR anchor. Sure there's debates about corrosion (especially in marine environments), visual impact, metallurgy reactions between dissimilar metals, the skill of the bolter who placed the dang thing and so on.

All told, they do the job, they provide multiple tie-ins (if the links are big enough) and besides, all climbers need to be able to evaluate a bolt the same as they do a crack before slotting a nut into it. Chains and bolts only become problematic when blind faith is applied and due diligence is left behind. If done right, they are reasonably minimal and stronger than the rope (by far) for as many years as the metal will last in a given environment. That being said, inspect everything and NEVER TRUST A SINGLE ANCHOR TO SUPPORT YOUR WEIGHT. Redundancy is key.