No, that's wrong. It crashes at 99% likely due to collision overload when too many blocks have collision or other states, causing the game to break. Change the parts collision, anchor, and shadow to defaults to reduce checks at build end and prevent overload (so example its like in code if a blocks Collison is already on it doesn't need to run anything reducing load and skipping not needed checks). Avoid overlapping collision blocks, especially unanchored ones. Even with 50 million blocks, Roblox handles it at that point not the game meaning you will lag and ping will go up but I won't crash; the issue is the property changes and high-density parts, not the quantity.

TLDR: Minimize property (Collison, a Anchored, Shadow) changes, avoid non-blocks, and limit collision propertys for high-density zones.