Ok you are right but I was trying to say is that prebuilt pc's are good but when you find a prebuilt pc built a pc with the exact same parts the prebuilt pc is because you will be able to customise it.
To give you an example of two prebuilt's, I recently bought an Alienware R10 and an HP Omen 30L. I purchased both because of the GPU shortage and my i7-3770K with a GTX 780 just did not cut the mustard in 2020. It did in 2013 but 8 yrs later, no way.
So I set out to build me another rig but at the time CPU's and especially GPU's were hard to find unless I wanted to deal with a scalper. My Alienware Aurora R10 came with a Ryzen 3800X, Liquid Cooled 1000w PSU, 512GB NVME, 8GB of 2933Mhz RAM, Wifi 6 and an RTX 2070 Super for $1249
. Not great but not bad either. At the time there was absolutely NO WAY I was coming close to that price with the GPU shortages. Deal wise a 7/10
The Omen 30L I bought directly from Amazon for $1999.99
and it came in a Mid Tower Aluminum case with an i9-10850K, Liquid Cooled, Corsair 750W Platinum PSU, RGB Lighting, 32GB of HyperX Fury 3200Mhz, 1TB NVmE, 2TB HDD, WiFi 6, RTX 3080.
The Omen 30L uses a close to proprietary case with standard parts and the fit and finish is top notch. Again, there was not a chance in Satan's dungeon I was coming close to that price if I wanted to build it myself. Deal wise a 10/10
So the bottom line is, you find quality prebuilts like the Omen 30L cheaper than it would cost you even excluding the GPU shortage. The Alienware desktops are a joke but it serves me well as a 1080p rig for now. The Omen 30L is hooked to a 4K setup.