And they stick to their guns. Malcolm and Angus are tight and won't let anyone fuck around with what they have.
AC/DC has had good management. The band really does not do anything different than they have done for years, but like you said, they time it right and everyone wan't another dose of the same sound again. Since Back in Black, nothing has changed. The early AC/DC did change more than the post Bon years.
When you think back on that time AC/DC only really released one albumin the 90s. Razor's Edge came out in 90 before the grunge era broke. They released Ballbreaker in 95 and by that time they'd been away long enough that people wanted to see them, plus grunge was imploding by then. Five years later in 2000 they released Stiff Upper Lip, which was shit but no-one cared because they missed them. Priest might have been better served to take that road rather than giving up completely.