This was discussed at length on a few topics, and most recently here when we disabled the auto-closing functionality.
We are not, however, reopening old topics en masse because there’s just no way to ensure that the ones reopened weren’t closed for a specific reason. If you find a topic that you’d like reopened, please feel free to send a direct message one of the moderators:
@Dana_Brown
@Alyssa_Foley
@Jason_Parsley
@Kem_Tekinay
@Anthony_G_Cyphers