I mean.....those numbers are really vague and you provide no info on what you meant by 'oc'ing.....kinda pointless to just list a bunch of numbers without any real insight into speeds.
And, given the numbers....3600 MHz is pretty....minimal, even by DDR4 standards. Especially in comparison to someone who wanted to run at speeds easily double that.....
As someone who is running something closer to that....there is a performance difference. More than seen on older (ie your) hardware.
See :
https://www.tomshardware.com/features/ddr5-vs-ddr4-is-it-time-to-upgrade-your-ram
Comparing even just DDR5 6400 vs DDR4 3600 shows some significant performance differences, depending on application, etc....Something that you very clearly gloss over and pretty much ignore.
Yes, it is application specific, but still, it's there if someone wants it depending on needs.
If we're talking strictly gaming, sure, it's only in the 3 to 5% difference. But to gloss it over and make it seem like there's no point? Nah....if he's got the hardware already, there's a good reason to use it if everything can support it. And given his hardware is pretty much identical to mine, why not?
Honestly, throw in 2 sticks, set up XMP and see what you can get, and how stable it is. I was relatively lucky with my kit, and it just worked fine by enabling XMP. Hopefully yours is the same.