That's a weird assessment, particularly since the R179s weren't even intended to replace 60-foot SMEEs.
The R179s don't show too much improvement over the R160s because they were never supposed to.
Production issues plagued the order for years, and even after the first cars finally arrived for testing, problems continued to crop up. The worst of them, however, were the high-profile incidents back in 2020, well after all cars had been delivered and many or all had formally entered revenue service. Their reliability may not be a serious issue now, but the continued issues that ultimately led to the MTA disqualifying Bombardier from bidding on the R211 contract left a real black mark on their reputation. It's telling that only about half a year after the link bar incident caused all cars to be grounded and a reactivation of the R32s, Bombardier sold off the division that built the R179s.