It might speak to there being some problems with state-side testing of devices for appropriateness on the battlefield but a 20% success rate of cutting edge equipment seems pretty good. Infantry folk are probably going to use the useful bits and pack away the useless ones - that feedback will eventually trickle back to fulfillment and the kit will be updated.

Also - I have a lot of faith in infantrymen finding really creative uses for tech that folks in the lab might disregard.

Then if it somehow falls through the cracks, it's on the commanders shoulders to pay for that piece of high-speed unused tech that the lobbyist swore would revolutionize the battle-space.