Benchmarks are pretty meaningless since they isolate and measure only one attribute i.e. speed. Also, if you want to use this metric at least try to compare like-for-like the RK356x are successors to the RK3288 and RK3588 is what you ought to compare with RK3399. As far as AI goes, there are better RockChip CPUs available with NPUs for AI than either RK356x with triple the TOPs. Even the RK3399 has an NPU but nobody really talks about that being as "more for people interested in doing things with AI" kind of context.
The RK356x are like a Jack-of-all-Trades and do a little of everything but more refined than RK3288.
The RK356x are like a Jack-of-all-Trades and do a little of everything but more refined than RK3288.