Given the amount of things we now need to spend glimmer on in other parts of the game and the RNG involved in finding that perfect weapon roll, 25,000 glimmer per Iron Banner engram is way too steep, in my opinion. Even when at max glimmer it's possible to run out of glimmer pretty fast if you focus enough engrams. Even popping a glimmer tonic isn't a sufficient enough method of regaining glimmer in a timely fashion due to the cost of engram focusing.