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Nevertheless, you can have public channels and in the same time taproot channels.
Note that if you have both public and private channels on LND, payments from others that are routed through your node will also use the private channels. This works because Lightning routing is based on nodes, not channels. So the routing information doesn't specify what channel to actually use.
I don't know if other LN implementations do this to. They might. I just haven't tested it myself.
This is a usefu privacy feature as it makes it harder to figure out where payments are actually going.
Will use the private channels only if there's a direct and feasible path to the destination. Usually on private channels you are not setting fees, but you can. so if you do not want to be used those ones for others routing, you adjust fees and min/max HTLC and you close the gates/valves.
But yeah, using the combination public/private channels have its advantages.
Will use the private channels only if there's a direct and feasible path to the destination.
I don't think you understood what I was saying. I'm talking about third party payments routed through your own.
You are talking about trampoline channels ?
No I'm not.
Ahh. So, there is just a difference in fees between a segwit transaction open and taproot transaction open for a private lightning channel?
Yes, I notice that are slightly cheaper. Not too much nowadays, but in a fees spike season is noticeable.
If your LN node have only private channels, will not be anymore a "public" node, will not be visible into the public graph, only by your peers.
Keep in mind: a public node is named public because is visible anyways in all LN explorers, having at least one public channel. And are mostly used for routing others payments.
If you are not interested into public routing your should NOT use a public node, but only private.
For the moment simple taproot channels are available only for private channels. Nevertheless, you can have public channels and in the same time taproot channels.
The STC are also implying less fees when are open/closed.