With respects to Alienware, that is what I moved off of with my new build.
During covid when parts were hard to come by I went with a prebuilt.
Alienware Aurora R10 Ryzen Edition
AMD 5950X
3090 GPU
64 GB 3466 Memory
2TB NVME
1,000W PSU
It ran great, never had any technical issues with it. As for it being “proprietary” that’s not entirely true.
Really the only proprietary component is their Motherboard and really it just limits you in terms of which CPU you could upgrade to. Dell publishes a list of other CPU’s supported by the board you would have in your system.
The GPU is a dell brand of an nVidia GPU just like ASUS, MSI, etc… That said, Dell doesn’t give you much options in terms of OC’ing the GPU but you can swap it out or use it in another system (which is what i did until the 5080 arrived).
The memory is just regular Kingston memory, the NVME can be changed out to any other one.
The real limiting factor is their cases. You would never get another manufacturer’s GPU into these cases. The Dell versions of the cards are so much smaller and they only make the case as big as it needs to be.
That said, you could take all the components out, and put them into another case, swap out the motherboard and really you’re out of the “dell locked in system”.
Would I recommend an Alienware? if you had no other options, yes. But, you can do it much better and much cheaper going other routes.
The other thing I’m not a fan of now a days is Alienware (as far as I know) doesn’t build systems with AMD CPU’s they went strictly intel.
Finally, I still have that AW system sitting right beside me, all cleaned out (physically) and a fresh install of Windows 11 configured and ready to go that is for sale