Reading Haynes again on which bolts should be replaced on this job, I appear to have failed to replace 9 bolts, but I was right not to replace the drive shaft to hub bolts. Some bolts should be replaced if they have torx heads, but not if they have hexagon heads.
I suppose Haynes is based upon GM instructions to dealers, who have all these items in stores so it's not a problem. I'll wager independent garages do not bother, nor do some private owners with 17 year old cars, even if parts are still available.
25 years ago I had the diff changed on my Peugeot 505 GTI family estate by a Bath main dealer. It cost me over £1000, and was returned with a wobbly rear wheel. I complained, and after many phone calls I learned they had used a slide hammer to remove the drive shafts, and had bent one. Instead of replacing it, they machined the hub to correct for it.