The primary reason for having the block allowance for the console versions is that TerraTech has to pass certification in order to be released, which means that TerraTech has to adhere to the console certification requirements (Sony TRCs and Xbox XRs).
The PC version is open-ended so as you add more Techs and use more blocks, your game save file grows and you can ultimately create very large game save files. With PS4 and Xbox One certification restrictions on how large game save files can be, we would always fail submission without addressing the open-ended nature of the PC game. So this is the main reason why the block allowance was introduced, with the secondary reason being to retain an acceptable frame rate to not violate performance related certification requirements.
Because of this, the block allowance cannot be removed for the console versions. But as
@Matt has mentioned, we can review the current block allowance limit and make a call on whether it can be increased without violating the certification issues mentioned.