I love cockers but I too, genuinly, do not understand which bits of the cocker is wanted in a cockerpoo. I don't really get what the cocker spaniel brings to that particular party.
Friendly? As are poodles; in fact, poodles tend to rate more highly for freindliness tyowards other dogs and strangers, meaning the cocker is likely reducing friendliness in the mix
Athletic? Poodles also
Size? As above, smaller sized poodles do that too
Ball orientated? OK, maybe that's more common in spaniels than in poodles but both are gun breeds so both have soft mouths and the desire to carry things in them
Intelligence? Not more than a poodle
Clinginess? Both breeds have tendancies to be clingy and bond more closely with one person in the family
Sensitivity? Both breeds are highly sensitive
Trainability? A poodle tends to be easier to train than a cocker, though both breeds are known to be 'biddable'
The only thing I can think is to soften the fur a little, which sometimes happens. i.e. to create the teddy bear look. However, both poodles start out with wavy fur and many poodles can keep the softer, wavier fur into adulthood.
It's a strange mix, tbh, because it's hard to understand what the improvement is that's being sought. Unless it's that cocker spaniels typically have bigger litters than poodles and so it was maybe a way of getting higher yield per pregnancy.