It wasn't really. There was a significant time to address it once it was known about, but it took huge amounts of effort and finance to avoid it.
I think a couple of hundred million was spent worldwide and to quote one major IT guy at the time
"If we had not addressed the Y2K problem the business would have literally stopped, It is clear that the point of sales terminals and crucial elements of the supply chain would have stopped dead if we had just sat back and ignored the problem.”