I think the frequency and level of impairment is what differentiates normal executive dysfunction from an executive functioning disorder.
Perhaps a bit rhetorical, but how often does this task dread occur? Does it also ever occur for things you want to do, not just obligated to do?
For me, I experience this issue for many tasks everyday. Then again, I have never had a normal executive functioning, so I cannot claim to know what it is like for normies.
I’ll also add that ADHD is more than just executive dysfunction too.