@Bhadra ji,
Howitzers have had a high angle of fire for a reasonably long time. Nothing new in it.
You are correct about the gist of your post.
India needs to invest in rocket propelled artillery, with intelligent munitions, like the sensor-fused munitions which I hear India will be getting from the US.
The stupendous effectiveness of artillery by the pro-Russia militia in Ukraine leaves no doubt in my mind that they might have gotten their hands on armour seeking and other types of intelligent munitions. If India can get those sensor-fused munitions, we can bust all Pakistani armour, if not their bunkers, with less, but effective shots, and quickly demoralize the enemy.
Range will always be an issue with non-rocket-propelled artillery.