Not Only But Also
To get a handle on the overall inequity, it must also be observed that:
a. Unlike politician's pensions, DFRDB is self-funded (deductions from pay throughout one's career)
b. Unlike pensions derived from super, the DFRDB pension is fully taxable.
c. Over the same period (shown in the graph above, the possibility of receiving any augmentative Veteran's Affairs pension due to a medical disability (injury, disease etc due to service) has diminished quite appreciably. The burden of proof has shifted from the Dept essentially having to disprove the claim, to the individual having to prove the claim. Whilst you may not see that as inequitable, the shifting of the goal-posts has meant that many disabilities (such as tinnitus and monocular vision impairment) are now dismissed as being "ageing related". In other words, you have Buckleys of ever getting a 100% TPI classification unless you've lost at least two limbs, two eyes etc.
That the service pensions situation is totally unfair and inequitable and that ex-servicemen are being exploited is 100% apparent. Because this situation is embedded in legislation, it's not going to change any time soon...... probably never. However that should just serve to further infuriate you and make you resolve to work to undermine those MP's who will soon seek to be re-elected. You should also advise generally against "signing on" for govt service whilst this "rip-off" continues.