If you think about it, how many accidents occur in the low speed
spectrum? Either from a stall, or from a high sink rate on approach,
or poor control use during an emergency or off airport landing, or
something similar?
In my opinion, the pilot who is comfortable throughout the entire
speed range of their aircraft is a properly trained pilot and one who
will not get into an inadvertant stall, or spin.
What are your thoughts?

I have a slightly different take on this. I am not an instructor but I
feel that slow flight is very easy to practice or teach compared to
some of the other areas of flight because it requires nothing more
than an airplane and an instructor. However some of the other aspects
of flying related to weather are the most difficult to learn or teach
(in my opinion). Learning to avoid rotors or learning to judge the
airplane's limits on a hot day at a higher elevation could very well
be more challenging because some of those aspects of flying involve
learning to avoid something which is harder to teach. Truth be told, I
have often wondered what the fuss is all about when it comes to slow
flight. After enough practice, its a piece of cake. In the last few
hrs leading to my PPL, I had no trouble flying very high nose up with
the stall horn blaring and the power up very high and not losing an
inch of altitude. The C-150 actually showed something like 35 knots
IAS if I remember right (although the TAS is much higher). My
instructor actually thought I was doing well enough that he didn't
want to spend time on slow flight on the day before the checkride
because he thought I was better off doing turns around a point which I
had trouble with. On the checkride, slow flight was something I was
eagerly waiting for to impress the DE.