Just so you know, weapon performance is usually pretty obvious to most veterans by now. It's a straight up numbers game.
Base damage, crit chance/critdmg, status, attack speed, STANCE (for melees) e.g. forced slash procs/animation speed, Unique weapon gimmicks.
People are usually able to accurately estimate weapon performance using datamined stats of new weapons even before release (for instance estimating the performance of Primed versions versus the originals). (assuming no unique mechanics).
Bo Incarnon has NOTHING in particular that stands out in any of these categories. It has mediocre stats, no unique gimmick, and staves just have bad stances.
Now let's compare it to some of the "S tier" weapons, Kronen Prime -> Tonfa stances are insanely fast, with multiple forced slash procs. For this reason, just about every Tonfa is "A tier" or better.
Glaive Prime - Unique mechanic of glaives, 1 shotting everything within like 15m, more like AOE weapon than melee
Praedos - Great base stats and unique mechanic of extra parkour speed to finish missions faster (and yes, another tonfa).