One of the main reasons that the CPL without an instrument is rare is
because the CPL required 250 hrs total time. Most pilots get there PPL
in less than 100 hours so that leaves 150 hour of flying. You need 50
hour x-country for the IR Plus about 50 hours of Instrument training
to get the IR, so many pilots opt to work on the IR Rating to the build
time need to get the the CPL Rating.

and you still have 50 hours or more to just fly or prepare for the CPL
test.

You will learn a lot more during that 50 hours of instrument training
that you ever will just fly 50 hours to build time, and you will have
the IR when you done.

Brian
CFIIG/ASEL