I put together my own as it is simple to look up what the best parts are and then they just snap together along with some screws. Install Windows and your other software.
The last time was nearly 6 years ago and that desktop pc with a gigabyte motherboard has after upgrades to 32gb ram and a SSD. It is very fast. The Dell Optiplex 5040 desktop from work built in 2017 is slow as molasses as everything is in the “cloud”
I will build another one day but it is not really needed.
It's called 'The Cloud' because they don't want you to see what they are doing to with your data...................