That’s not how hard drives work, and doesn’t take into account that OP might want to download more than one thing at a time.
Hard drives are fastest when they are moving large single files. SSDs are way better than hard drives at lots of small random reads/writes.Setting qbittorrent up so that all the random writes inherent to downloading a torrent go to a small ssd, and then moving that file over to the big hard drive with a single long writer operation is how you make both devices perform to their best.
You won’t be able to do ultra, but you can do high at 1080p30fps in most every modern game pretty easily for that price. 1080p 60fps for a solid chunk of them too.
https://ca.pcpartpicker.com/list/MzFVh3
https://m.youtube.com/watch?v=A6coMhaOw0Q
Your point still stands though; you’re still better off spending 1000$ so that you don’t end up shooting yourself in the foot with regards to upgradeability, which is one of the big reasons people want a PC in the first place.