3 points of control here and there on the new pieces is not "meh". It is absolutely 100% no if-ands-or-buts about it REQUIRED to do 4 star crafts. The actual value of those few points of control is minuscule in terms of how much quality it gives. However, they're necessary to meed the new crafter gear check for 4 star crafts (451 craftsmanship / 407 control). Unless you penta-meld the new offhand tool with tier IV materia, it is impossible to reach the minimum reqs for the new recipes without the new i60 crafter body pieces. So no, it's not "little reward", it's 100% necessary and worth it.