Yes, because the computer assumes they're not going to change. The "tensile structure" looks cool now, but throw it in the back of a truck for 3 months and see if it's still algorithmically perfect. Parts get beat up. Tabs get bent a little. Maybe we'll want to grind off one of those tabs that we're not using because it's in the way, or weld on a new one. With the old structure, I can see which parts are relevant to maintaining the integrity of the system.
It looks like an un-optimized binary, which is very close to its source code. That's a feature. I can reason about the parts on their own.
The "topologically optimized" one is like an optimized binary. It's great for saving a few grams as long as you never have to change anything. The downside is that it's impossible to reason about. If one tab gets a little bent, that may be harmless, or it may cause the entire structure to lose its strength. You don't know.
Similarly, the truss on the catwalk over the crazy-looking Wendelstein 7-X is made of nice even rectangles and right triangles, and I guarantee that's not because it's a topologically optimal shape for this truss.