If this is a centralized service using a protocol they designed, it would resolve most of my concerns. Although one concern that would remain would be the fact that I was attacked by a shill when I tried to ask questions.
You made up the nonsense about the wallet connecting to random fraudulent nodes, and the shill accusation. Don't expect everyone to just roll over and not talk back when you do shit like that.
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A (potential) advantage would be the ability to withdraw your funds using the backup locktime TX even if the centralized service goes down, is seized by the FBI etc.
Also lower transaction costs and liquidity provided by third parties, but that benefits the service more than the users.