Is Artillery Still Relevant?
YES and NO
YES. Nothing conventional (non-nuclear) delivers the volume of blast effects and shrapnel at less cost than artillery.
YES. Technology has improved the accuracy, range and effectiveness of the artillery family of weapons.
NO. It depends on your adversary.
The United States and other developed countries can return counter battery fire while incoming artillery and mortar projectiles are still in flight.
No. Drones large and small have changed warfare. With the proliferation of Unmanned Ariel Systems (UAS) wheeled artillery is largely obsolete.
NO. Most anti-aircraft artillery is obsolete with the advent of shoulder fired and other more effective anti-aircraft rocket/missile systems.
NO. Other than tanks, most anti-tank guns have been replaced by more effective shoulder fired weapons and other types of anti-tank systems. Some anti-tank guns have been observed in use however, in Ukraine.