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Repairing a trashed credit score is not as simple as "pay off the debts and all is well".
Secured cards are for people who already trashed their credit and cannot get a card, or have no credit and cannot get a card with the limits they require.   
They are meant to have the functionality of a credit card (online purchases and such) for people who cannot get one. They are more debit card than they are credit card. >

Lol
“This card doesn’t provide a function it’s not meant to provide therefore there’s no point to it”
Prepaid cards are super useful for a lot of people.  One of the biggest advantages is that they prevent you from spending money you don’t have.