Other folks may obviously pick other components but the justification for this selection revolves around longevity - in other words, the motherboard will support future Ryzen processors, the RAM is ratified for that motherboard, the boot SSD is very robust and quick, the case has plenty of room, etc.
Hi I really like the 32GB ram but its only 3200 speed and Bitwit always says that 3600 is the sweetspot and (just my opinion) couldn't I just buy a 3700x and overclock it with the aio?
If you're happy to overclock, and accept the fact that CPUs vary quite a bit when it comes to overclocking headroom, then a switch to the 3700X and DDR4-3600 comes out like this: