They are useful

Fixed setting player properties
Changed player rotation to float3
Added constructor for BlockColor with an index param
Improved Player.Exists() ~~hopefully~~

A bit hacky, but it works

Apparently they're processed, unlike in my save

Added an event for placing and removing blocks
Added a class to wrap event calls in a try-catch
Removed BlockDoesNotExistException
Made Block.GetSimBody() return null if block doesn't exist

Added center of mass
Removed delta velocities

Made GetBlockInfo() always return a reference without needing it as a parameter
Fixed Color property
Added CustomColor property for temporarily setting any color

Added API for adding more information on the debug display (not object-oriented yet)
Removed the setter for block type to ensure stability
Made the block API return defaults if the block no longer exists
Added property to check if the block exists
Made a struct for the block's color property
Added missing block IDs

Placement, movement, rotation, removal
Block looked at (in Player class), connected blocks

Removed GameState methods from block APIs
Created a BlockUtility class to get the block the player is looking at
Changed the return type of PlaceBlock, returning the ID of the newly placed block or null