Reasons not build a PC
1 - overpriced RAM due to supply
2 - overpriced GPU due to mining
3 - if you have a OC i5-2500k or better you are fine on the CPU side. New Gen consoles just launched and they simply re-used the previous consoles CPU with a slight OC. AAA pc games won't be as CPU demanding as fan boys hope for 1080p 60 FPS gaming the next few years, until replacement consoles launch (2020-2021).
4 - monitors outside of 1080p 60hz are still pricey especially if you want an IPS model as opposed to cheaper TN.
5 - 6 core+ CPUs have yet to mature on the tech and software side. Remember how great the intel Q6600 and Phenom IIx4 955 were? Great to OC, fantastic synthetic benchmarks, yet on the intel dual core 8400 was outperforming them in gaming. Fan boys stated wait until games are optimized for multicore...and they were...eventually...when the intel 2500k launched. That chip made minced meat out of both the Q6600 & phenom II x4 and instantly became the go to gaming CPU.
Could not have said it better, you hit all the marks
My lowest end PC still plays Shadow of War.. just fine.
Would love to upgrade, but that will be for 4k and everything is still way to expensive
to consider upgrading. Very little return on any investment