What most people don't see is that the third stage is 1.8 meter dia.
Much wider than any missile Pakistan has..
It was to be part of a longer range liquid fueled system which was never made..
Now reincarnated as payload stage of a solid fuel missile.
Cobbled together parts of an ancient system and a new one.
Both tried and tested on their own.
Now being tested together.
This latest missing firing shows increased confidence in the system.
A missile is only fired from deep inland and flown over inhabited areas , if it's proven it's functionality and now reliable.
Last test was from sea shore. So that if anything goes wrong it all falls in the sea.
Now they are confident enough to fly it from deep inland.