Mints = trusted 3rd parties are security holes. 

However, anything not truly decentralised, and bitcoin is the only truly decentralised coin, will have trusted security holes. These are called shitcoins and shitcoins will have a place  for buying coffee and groceries, as long as  the risks are understood and accepted. Just the way it's going to be. LN(non custodial wallets) will battle to compete IMO, under bitcoin fee pressure LN failed.