So, imagine your machine is one of those Dell Optiplex contraptions of the 2000s and even early 2010s.

Those machines sucked for the reason that, their components were tightly compacted, very little wiggle room to do anything in, upgrading anything was next to impossible because everything had to be low-profile to even fit into the case, everything was a dust/heat nightmare waiting to happen.

Just so many vulnerabilities in those machines are exactly what you could be facing if you go this route.