They don't bother me because I have not experienced those issues. My purchase was a dealer loaner, certified with extended warranty, with 4k miles when I bought it, so one or more of these TSBs may have been applied. Dunno. Should I be on the lookout? Sure. Am I alarmed? Not really. The operative terms in the TSBs are "some customers" and "some vehicles".
How many? How many encountered the dangerous conditions bringing about the recall? Not many. Like any other vehicle, if it runs good, sounds good, feels good, the mpgs stay constant, and it doesn't flash an idiot light then I'm good.
Since the issue at hand is CD, have you pored over the the TSBs for the non-CD turbos or another maker's vehicle in this class with a reputation for reliability? I'd guess you'll find "some customers" and "some vehicles" having some comparable issues if not worse. Or consider the non-CD 2017 CX-5's 1/5 CR reliability for the brakes. Choose your poison, or better put, odds of poisoning.
I'm not blind to potential problems like carbon buildup. I concede to using Top Tier gas in the CX-5. I'm fortunate to have long, flat, straight, lightly traveled roads all around my house with good visibility for cops, so every couple weeks I floor it up to 6,000 rpms and about 85 mph. Maybe that does some good as a preventative measure. Maybe not, but it does get my blood stirring.
I don't mean to diminish the experiences of others encountering problems, and there are knowledgeable people here who can help. Had I not been here I would not have been turned on to the aforementioned TSB that improved the vehicles driving characteristics. But when considering reliability in making a purchase it comes down to odds, not certainties.