HCMC did ask for it in my case and others who filed 2-3 years back.
HCMC may no longer ask for one, but does not mean they won't.
If you can get one easily, get it. Or else, just wait until they delay your case and then go get one.
It's up to you really, I learned I have no control over a lot of issue in this process. It is recommended to cover all the basis and matters that are in your control. Sure, I would be doing EXTRA evidence and support documents, but what else could I do to make sure all T's are crossed and I's are dotted. The answer is: documents that were requested in the past by HCMC, may not be the case nowadays, I will have them TOO!
That's just me brother

Rather be safe than sorry, I'm sure where AnhMap questioned it, he thought about it too and couldn't sleep

So, again, if's easy to get one, get it! IMHO!
Chuck and Kim