This is a well discussed subject.

Tools that are built by yourself are possibly the best.
Strenghthen Tools are always built by deep thoughts is mind.

In my resarch at 8051 area of code I can see a lot of code
to be rewriten again and again. Library code can only be
considered when there is a specific project at a well established
hardware and firmware. For the many circuits be made
by this famous MCU every developer have to consider to have a
look at similar projects and decide what is beneficial for the
current project.

So I agree with you Erik,
just give space for a sense of personal reusable code
and help to the ones' that asked for it.

K.L.Angelis