This pretty much 100% needs to happen just so Anvils doesn't become a super 'brake-check' list like what Skryre fyre used to be. Because as the rule is currently worded you could take 1 unit of 12 longstrikes, 15 liberators, a Castellant, a relictor with bless weapons and 3 min units of skinks as your whole list and have the longstrikes shoot 14 times in your first turn with 2 layers of chaff to block deepstriking.
The usual blah blah blah applies; what if they shoot you first, what if they can stop your CA, what if they can charge before you shoot, what if they have umbral spellportal, what if objectives, what if yadda, yadda, yadda. The point is that this list is eventually going to find someone who DOESN'T have the tools to stop it and that person is going to have literally their entire army killed in his opponents first hero phase.