Why’s it so complicated to pick good pc parts?

Lately it’s been hell for me to pick out good pc parts. For some reason it seems I do such a terrible job. I go to pc part picker. Set up a build, show it to people, and then they always tell me that there’s a bad part like ram or storage or an overpriced power supply.

What’s the pain in picking out good pc parts with good specs? I have $10,000 and with a fraction of that or $5,000 I could make a fantastic gaming pc that gives my vr headset high quality graphics and fast performance if only I knew what I was doing when selecting them.

I’m starting to wanna buy a prebuilt instead of struggling just to have a pc that freaking works and I can just get on without any trouble