OpenBazaar is garbage.
You seem to be a merchant, do you have negative experiences that you're so upset?
Mainly because when user is not online and no one else has a copy of their store there is no way to find that store or place an order. It's a stupid system. You will never make money selling products or services on it.
OpenBazaar 2.x, they write, should use IPFS to mitigate that problem. But anyway, if I were a professional merchant I would ensure that I'm always online. It should not be so difficult, either have a cheap low-energy device (old laptop, Raspberry Pi ...) running 24h or pay a cheap VPS (which you'll have if you're selling on other platforms, too).
It is also not impossible to develop a search technology to at least find stores that are currently completely offline and sharing the list (via website or even via a P2P app).
Oh and they leak 100% of everybody's data and IP.
Of course, most data on P2P apps need to be mostly public. But something seems to be possible to be hidden
via Tor.
I'm sure LN could be relatively easily be integrated into OpenBazaar or other similar platforms. But it seems
this would accentuate the problem of vendors being 24/7 online and thus they currently don't want to add it.