Because its the degree that matters...ffs
The degree demonstrates two things:
(1) A base level of knowledge, which does not necessarily indicate talent in the field so its not the sole qualification.
(2) An ability to **complete** a long bureaucratic process that includes some uninteresting tasks. That may be the more important thing demonstrated.
I don't know where this myth comes from, but it's bullshit. If you properly test the system, you'll catch any error producing instability before depending on it. A bit flipped is a bit flipped. They happen on stock systems too. This is why any sane system handling critical data has built in sanity checks.
No, the BS myth is that you can test for instability. Every manufactured CPU is unique. Its weaknesses unique. The point and manner that it fails unique. Some failing with a modest amount of overclocking, other not failing until much greater overclocking. And again, the failure is not necessarily something resulting in a crash. The mildest of overclocking errors can simply be an erroneous result of a mathematical operation.
Where a bit flips will vary from one CPU to the next. How can you test for that? And in a specific case when a bit flips in an instruction may depend upon the preceding sequence of instructions and upon a specific data pattern. How can you test for that, the prerequisites are unknown and vary one individual CPU to the next?
Testing by a manufacturer can involve things far more probative than running a software test. So a CPU rated for a certain speed can be confidently run at that speed. However once overclocked the confidence is lost. How much tolerance there is for overclocking can vary from one design to the next, one manufacturing process to the next, and from one individual CPU to the next.
The only good way to get what you want is to build one.
Absolutely, you get the exact parts that you want. Pre-built always seems to involve some compromise in one part or another.
Careful selection of parts is also very helpful if you want to do something like dual boot Linux.
Building your own is no longer the money saver that it once was though. But quality and compatibility are reason enough.
Building a custom computer? All you do is put the parts together. The hard part is picking the right parts.
Which is the same thing that Dell, HP, etc do. Screw together some parts, at least for desktops. Laptops can involve a little bit of design with respect to layout, to get airflow cooling right.
Aren't they the size of a filing cabinet?
That was just the external hard drive, more a full sized rack in their 1st generation, plus another rack for peripherals. They eventually got down to desktop workstation size. Maybe palm sized now with the Pi. How does a Pi with a remote text terminal session compare performance wise to a PDP-11
If you can't learn to do it well, learn to enjoy doing it badly.