Why was the Singularity removed?

[Spy_Guy]

The sing-bomb had gorgeous sprites. Be fun to see reworked as a proper black hole bomb.

That's actually my motivation for reviving the thing.
Mind you, the singularity bomb black hole is a lot more like the singularity of old than the regular black hole.

For one it sticks around longer, it will also move around a lot more on its own. The reason you don't get a permanent black hole is due to it not being very fun having an item that in practice ends the shift when used.