I thought it would be worth to upgrade the motherboard in the future but if it isn't then I obviously will keep the X470.
I don't really want to do some fine tuning so I'll stick with XMP and take the 3600mhz RAM but sadly I just checked and it appears the current motherboard (Asus Tuf X470-Plus Gaming) doesn't support XMP for 3600. So I don't really know what to do, it only goes up to 3466, so what should I do with that ? Change motherboard or go with slower Ram or is there still a way without too much fine tuning to get 3600mhz.
It more looks like they just never updated the product page to take into account Ryzen 3000/5000 series's significantly better memory controller. If you look at the QVL for 3rd gen chips (it's the same memory controller as Ryzen 5000), 4400MT/s kits are rated to work on that board in 2 DIMM configurations, and there's a couple 4x8GB kits rated to work at 3600MT/s, so 3600MT/s should be able to work.
If you want to save some more money though, 3200MT/s isn't that much slower on a single CCD CPU and is usually a bit cheaper as well.