Since a board exists for a few wallets, so I think Lightning Networks deserve aboard. Most forum users unaware about Lightning networks and how it works. So it would be easier to learn for them from a single board. If a thread creates for Lightning Networks, then it's going down after a few days. Lightning Networks is the most potential for Bitcoin adaption. So the idea isn't bad those are suggesting a board of Lightning Networks.
I never knew the important or mean of LN not after I came across this topic. Since LN play an ambiguous role to bitcoin adaptation, it will be a good idea to have a separate board for it. This way every member of the forum will see any latest update about the Lighting Network.