From a concern point of view they don't leak or give any related problems, so I'd not unduly worry from that perspective.
As to using it, free choice I feel. The F2 motor had a few things that lead them that way as well as lowered overall gearing, so running more revs generally. They also increased surface area of fins on head and barrels as overall package of final spec.
I could see that if you were to use a fairing it would be desirable, but not a large difference whichever you choose.