Not sure why you say tied up? It’s still fully self-custodial. You can close a channel at any moment, there is no lock up at all.

It’s simply how decentralization works. Same reason we want multiple nodes and multiple miners on the base layer. Multiple nodes and multiple channels per node is what makes LN decentralized and amazingly robust! Any one node on the network can go down and I can still transact flawlessly.

If someone is relying on a single channel and complaining when it goes down, it’s not a fault of the network itself.