"they lack the sophistications and convenience "
I don't know what's meant by "sophistications" in this part of your post. With that said, you can pay for a super expensive pre-built pc. If the extra minute of set up time is too much you can also pay to have someone set it up for you. You can also pay for your future upgrades if you don't want to just buy a new PC every year. Even amazon has an "expert installation for $XX" option when buying parts.
http://www.dell.com/en-us/shop/dell-desktop-computers/new-alienware-area-51-threadripper-edition/spd/alienware-area51-r3/dpcwya00b3?selectionState=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
4 ≈ One
