Is there any point to buying a pre-build/refurbished/OEM desktop

It sort of makes sense to buy a desktop, if you're only looking for programming and old games (depends on how hold), but realy if you're buying a desktop you're probably gonna look towards upgrading it. I did this not too long ago, and managed to eventuawly work my way up over time to a better computer. If you're low on money this is what I'd do, but if not then I'd spend the time to research a custom pc. It's not too difficult.

Building a pc is like legos; it's about putting the right thing in the right place.It may seem daunting and complicated, but my 10 year old brother figured out how to build one, so it's realy not difficult.

With regards to testing and troubleshooting; there's not particularly much you have to do, for example I had to test what broke in my custom pc and it was abotu a half hour process. It was tedious, but since I found it out it'd be quicker to send the indivisual part then the whole pc.

If I were you, I'd either fully custom or buy a pc with either a good i5/i7 that has expandability, so if you needed more power you could put that into your pc.

that makes no sense and the other options are better in every way. Buy a laptop or build a desktop.
unless you want to get an imac for that screen or someone gives you a deal or something. There are reasons to buy a premade desktop, but I don't think you have them.