Good RX/Cost Plus drugs question

As the title states, I have a question about sites like Good Rx and Cost Plus drugs (the Team Cuban card). First of all, I understand its not insurance. But should I still have insurance if I were to use them?

Like right now, through my organization, I pay about $60 a month for prescription drug and my organization pays about $250 for me additionally. I am on a daily medication that I get 100% covered by insurance so I when I pick it up, I do not pay anything. WIth that being said though, I feel like the cost of the medication is way less than what I pay per month. Now I do understand that the insurance I have would apply to any other medication I may need to get due to injuries/illness and what have you and my out of pocket cost will vary on those.

Also, if I need to go to the hospital at all, lets say for a surgery, I think the meds they give you there are billed through my Blue cross health insurance, but I could be wrong, maybe it is billed through my current prescription insurance, not sure.

My bottom line question is that are Good Rx/Cost Plus supposed to only supplement prescription drug insurance or are they meant to outright be a substitute? Like If I go to the hospital for something or a surgery, I don’t want to have to deny medication when I am sitting in the bed due to billing reasons and get it from a pharmacy later. I want the whole process to be easy.