(With hot funds, you must constantly watch for theft attempts by an evil channel partner and react)
quotingLet’s look at lightning. Today, it’s not possible to have funds on lightning without
nevent1q…t89l
1⃣ exposure to counterparty’s theft attempts
2⃣ keeping them on an online device
So the logical choice is keeping most funds cold & safe, then using the chain to move a little at a time into LN.