CAP was never designed as an end all template you blindly apply to large scale systems. Think of it more as a mental starting pointing, that systems have these trade offs you need to consider. Each system you integrate has complex and nuanced requirements that don't neatly fall into clean buckets.

As always Kleppmann has a great and deep answer for this.

https://martin.kleppmann.com/2015/05/11/please-stop-calling-...