Resiliency may improve reliability on the whole, but………..
Resiliency supports reliability, but sometimes, and in IT especially, all the extra services like backups, alternate sites, automatic failover, automated retry, etc. add so many parts that things seem like they are always breaking somewhere. With the right design, the system itself does not fail. But damn, there is a lot to monitor and fix all the time to make that larger failure not happen. Yep, that is #IPAWS; highly reliable, very resilient, and aways with some issue somewhere causing a problem. But saving lives every day.
