WHy doesn't anywone take Arco flagellents?

I am currently working on an inq. list.using coteaz. I thought it would be cool to use the arco flagellents in place of death cult assassins but it seems no one uses them, why? Thanks for any help.

i think it's because they have lost their power weapons ... so they don't strike as hard as the DCA imho.
Aubec

in general a model without a power weapon will have to have about 3x as many attacks as a model with power weapons to be equal.

assassins are good close combat all around against everything to where acros just deal out alot of attacks, against IG their good against wytches from DE they will get pistol whipped