That's my belief as well, yet even artillery has an ultimate limit. We have made great strides in heavy vehicular research.
There's two things we need to handle at all times: Economy and Military, because they go hand in hand.
If we strengthen the Economy, make supplies, sell things people want, we can get allies, technology, equipment, and military personell.
Regarding the Military, yes that is our strategy. The use of allies and other forces and supporting them instead through long range artillery.
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Regarding PSION's, I'm hoping to integrate more psions into communications and pilot work as both artillery crews and tankers.
For example, a project I want to work on is POINT.
The "Psionic Overwatch Integrated-Network Targeting" or POINT is meant incorporate psionic tank pilots in telepathic communication over long distances.
With such a system, any psy sensitive person or tank that engages or spots an enemy can instantly and telepathically transmit usable targeting info and data to any other MBT-01 within artillery range. Information on enemy type, altitude, longitude, latitude, and movement of the target will be transmitted in live time directly into both the mind and targeting computers of the allied tanks.
Automatically our pilots and tanks target the hostile and fire upon it from range, using the info given to select the type of shell the angles of fire. In addition they will be able to use their psionic powers to directly oversee and guide a shell as it falls for even more accuracy when needed, or simply fire as fast as possible if firepower is required.
All of this reduces precious time wasted having to transmit data to a central artillery command, calculation, and then retransmitting that data back to the artillery unit in question. It also means that any enemy in range of one tank will be in range of the other tanks in an area even without a direct line of sight.