So it's imho it's closer to "failed experiment", although it's not even known enough to be called like that by such a number so it would matter...
In some ways, DeFi still feels like a solution in search of a problem. For most people, it doesn't serve a real-world use case yet. Which is why it's primarily used as a buzzword to peddle scam tokens and fleece the gullible at the moment. Conceptually, it's a fine idea, but I'm certain there's a long road ahead before people really
need this technology. I wouldn't say it has "failed", just that it hasn't discovered its true purpose yet.
You are absolutely correct. Adding more to your point, DeFi is just a buzz word which many have used to create the same solution to a problem which doesn't exist.
Even if it does, what's the use if many coins are solving the same solution ? This is why most of the DeFi tokens don't even have any value these days.
For OP, DeFi is already there and it does not need to provide the same services on a different network. It won't change anything but just create another buzz in the market with no actual value.