Hey andy,
Thank you so much for interesting about helping me.
But, let's be honest for a moment. Moz is a great place .. yes it's. Moz provides a lot of helpful and useful different things. Some for free and some for money. About things for money, I would like to be so authoritative. I will pay per time so I want to take per time as well.
We pay for quality and fast results, we pay less for slower results. Poor results don't deserve any money.
I do agree with you that Moz will never crawl the entire web. But perhaps it will crawl part of the web. As you check website backlinks, you will realize that you never see same results. Ahref discover some, SEMRush discover some, Google discovers some, ..etc.
We use them for different reasons. Most important reason is to know how much you site is trustful and authority. Because these factors affect our ranking in search engines results. And we know that there's no perfect tool. But, they do help. If not, why we have to use them?
I wish Moz improve they services soon.
Thank you very much and All the Best,
Eslam