I imagine because no one sees a runway it’s not so easily spotted from above especially because it’s mobile. The current suicide drones don’t have a lot of explosive power. Look at what Israel did in Gaza. You know they wanted to use the big bombs to level entire multi-story buildings. You want that kind of power in a suicide drone.
There are a lot of soft targets where a small warhead is fine.
The Geran 2 is being listed as:
2500 km with a 52 kg warhead
1000 km with a 90 kg warhead
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Also, remember that Israel wants to get rid of the Palestinians, one way or another, and then take their land.
You have serving Israeli government ministers openly and publicly saying they want to perpetrate an actual genocide, yet they have not been removed.
So we can see that Israel does want to destroy every building in Gaza, and that the US was actively supplying weapons to Israel to do this.
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In comparison, for China, it only makes sense to destroy multi-storey buildings when faced with urban warfare, which effectively means Taiwan. But the goal is not outright destruction because:
1. There will be other higher priority targets than every single building
2. Afterwards, China expects to incorporate Taiwan, so there's no point inflicting unnecessary destruction
3. There are a lot of personal and business relations between China and Taiwan, so again, there's no point inflicting unnecessary deaths.
So there should be a lot less demand for heavy munitions to destroy every building.
And for missions to carry heavy missions, using spare, second-line, 4th-gen aircraft to deliver heavy glide bombs is likely the most cost-effective option.