That shouldn't be surprising in the slightest though. That's a 7 year old chip, predating Apple Silicon.
I just checked and the M1 Pro gets 3806 in single thread and 21867 in multi-thread with CPU Mark. That's a more interesting comparison imo. The A18 Pro is a good step up from the A17 Pro, so it's incredibly impressive how performant the A-series has become.
My M1 Pro MBP is still stupidly fast and still has amazing battery life, so I also wonder if upgrade cycles aren't getting longer and longer. It could be quite a few more years before I upgrade.