You cant control what another node does either. If they disconnect, restart, or whatever. You will not be connected as a peer anymore 

Eximpius

If you want in bound liquidity and you want to use something like amboss, you will need to connect to the peer you are buying the channel from, so they can more easily find your node to open a channel.

Thanks. Ok that I get, but why allow me to add peers into a list. That feature seems a bit weird. If i open a channel, the peer is added automatically, so why would I ever want to add a peer manually and then open a channel?

swmtr

bitcoin

What is the point of Thunderhub peers without channels?

You need to add peers if you want to connect channels. You can’t create a channel or them a channel too you without them being a connected peer first. 