do you honestly remember why Discovery had to go into the future and be “erased"
It was to ensure there was no way for Control (which they were not certain had been eliminated) or anyone else to get hold of the sentient sphere data in their possession. I admit the episodes are a little muddled, but it seemed like the original “Perpetual Infinity” plan had been to go into the wormhole and never emerge, which isn’t exactly what happened in the end.
and even if you do … does it feel like a good or interesting story point to you?
Absolutely, I think the 32nd Century is pretty great, and the time jump was the means to that end.