Describe your suggestion

#sel terrain restore
Would get the seed and restore the selection to what it was before user interference.

#sel terrain fix
Would adjust the selection to look like regular terrain.

#sel terrain adjust
would have options like dent, raise, and other things to adjust the terrain to your liking

Settings

Restore option.
fix option.
adjust option.

Context

this would greatly help if you were trying to revert explosion damage, make an island, or anything terrain-related.

Final checklist

• I have not used any OwO's or UwU's in this issue.

This sounds alot like worldedit's naturalize command. It would be nice if baritone had this in order to do this in survival. Also, you could add a similar option to worldedit's smooth command. Its a very useful way to smooth out cliffs into hills, but again you can only do it in creative in worldedit, so baritone having a way to automate it in survival would be very nice.

Seed crackers are out of scope.

it would just use minecraft terrain gen to figure out what it looks like or you could enter the seed if you knew it to get the original terrain.

That's what a seed cracker does, yes.