Currently, Giant blocks play a sound for every small block broken. This should be changed to playing the sound once and making it sound deeper and maybe slightly slowing it down (will need experimenting).

To coincide with that, instead of having breaking particles for each regular block, we should have giant breaking particles for visual ceherency and consistency with the expected amount of a single block being broken.

It also used to be the case that if you broke a 4x4x4 area of Stone, it would give you a single Giant Cobblestone. It now no longer does that and only gives you Giant Cobblestone if a 4x4x4 area of Cobblestone is mined.

The size and angle when held should also be restored back to how it was. The full texture instead of the truncated one can remain as is. To me, with it now using the smaller looking full texture, the block feels really small in your hand now, even if it may be consistently sized in comparison to regular blocks (this was mentioned by one of the other devs).

1.7.10 and modern respectively:

Block breaking speed of at least the Giant Log block also should be adjusted back to what it was to maintain the idea that you're using a pickaxe to mine wood. 1.7.10 and 1.21.1 respectively:
https://github.com/user-attachments/assets/31208fab-fc3a-4801-99de-28fe0d7e1b06
https://github.com/user-attachments/assets/b2623c57-91b9-465c-b97e-dcb8bf325d6c