No not needed at all. Lost souls are the type of enemy that will wreck you if you make a bad mistake though, and a fleeing swordmaster has a much better chance than a tanky guy, unless your tanky guys usually have high mdefense. Also, they can close on you and just flat out swing at you, it seems rare but it’s happened. Getting someone surrounded by lost souls is bad for business. As for fighting them nude, you always want to act before them if at all possible. I just don’t care enough to go through all the equipping for a slight beef against guys I don’t have a problem with.
I use hit and run, pick off as many as I can and use polearms to keep as much distance as possible. Don’t ever use 1 range weapons, too much can go wrong if you’re standing right next to one of these little punks.
In all honesty, I fought them only twice so far; so I haven’t seen when things go wrong. So perhaps it’s not quite as easy as I thought (but then, half of my team has Fortified Mind, and the other 2 Captains have over 90 Resolve, so I don’t see how things could go wrong).
