I run tubeless on all my bikes (road, TT & mountain). I have, thankfully, never seen this issue (where's that wood to knock on...). However, the guy who got me into tubeless had an issue with his first set of Shimano wheels. I believe they were DA7800 series wheels with the raw aluminum finish (not black annodized). His wheels were pitted within a couple of months of use, and he eventually sold them off. His next set of wheels (another set of DA7800 wheels, but the "tubeless" variety, with black annodizing) did not suffer this issue, after two years of tubeless duty. Both wheels used Hutchinson Fusion or Intensive tires and Stan's sealant.
I have lately switched over to my own "homebrew" sealant, which I hope will continue my good fortune in this aspect. It's two parts Stan's to one part Slime sealant. I just don't find Stan's to be effective for sealing anything beyond a pinprick on the tires, while Slime is just too thick. However, between the two, they provide good sealing and can patch slightly larger cuts. I recently had a 1/4" (6mm) cut on my front wheel, but the sealant kept about 40psi (3bar) until I pulled over at a store to put a tube in.
Vlad, to answer your question, tubeless road tires allow you to run lower tire pressures without risk of a pinch flat. This also has the added benefit of having a slightly larger contact patch to the ground, and dulling out some of the road buzz. If you ride somewhere with great quality roads, it isn't much of an issue. However, where I ride, the quality of the roadway is very poor, with a lot of substandard material used patch and pave the road. Tubeless provides an improvement to the road. The trade off may be a slight elevation in rolling resistance, but nothing I have noticed in my rides.
Trek Crockett, Madone, Superfly, SpeedConcept & Cobia