The mission to get the black spindle is a challenge and it was worth all the effort when it dropped at 310 but now it drops at 290 with the same difficulty to get it. I think that it should be a bit easier for the attack that it is dropped. For instance a way the mission can be balanced is less enemies (or blights) or add more/remove time all together.
[armory]Black Spindle[/armory]
[spoiler]and while on the topic of black spindle i think since it is an exotic black hammer and the black hammer's white nail perk was nerfed that it would make it fitting if the exotic version had the original pre-nerf ability.[/spoiler]
but this is all just my opinion and most of my friends agree.
EDIT: B8 is as taken as Oryx
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ToM is 310 and requires a lengthy chain quest that includes doing the raid, finding 45 calcified fragments, doing a couple difficult story missions, farming materials for hours and a somewhat annoying light 300 strike. Black spindle is one story mission that might be difficult for gaurdian less than 290 light. Imo the reward is justified by the difficulty of the strike. Maybe my opinion is biased because it only took my two tries. Also 290 black spindle is more than enough to destroy bosses in the raid. 290 black spindle>300+ any legendary sniper in kings fall.