I agree that it’s sacrilegious to do that, however, it’s not uncommon in the industry nowadays. No matter who the singer is, how talented he is, how good his pitch is, pitch correction will be applied to vocals regardless. It’s just the norm in the music industry to ensure a vocal is 100% in tune.
It is also done for live performances, by the way. There are very few live album releases that have come out in the past 20 years and which don’t contain pitch-corrected live vocals. Queen’s Hungarian Rhapsody is a great example for this.