I disagree with you on this, there are actually a lot of ways to farm feedstock(improved) just read the description of the item and where it drops.
I did 20 dungeons today (RM, AQ and GV) and I got 9 improved feedstock. Do you think that that's enough or fair? The friend I queued with got lucky and got 12.
Just for fun, I played again on my gunner on Mystel and before the patch my ilv was 481, since yesterday night i'm 498 and my total playtime since the new patch is 5.5 hours, I did have some gold and improved shards but it is significantly easier to upgrade, you can get to 498 much faster and with a lot less fails or downgrades, also a repair of the item costs 1 shard.
'Some' was propably a pretty high amount or you were insanely lucky. I failed at least 15 times on my chest and my weapon aswell (which were +12 and +13) and my weapon is still not +15. I did not try to enchant my sleeves and boots. I need to run at least 10 dungeons to be sure that I get enough mats for one other try as I do not get one guaranteed armor and one guaranteed weapon feedstock - or a guarenteed drop at all. And I ignore the gold factor completely here.
I agree with Sewin. I need improved feedstock for every stage of enchantment, but I only get one per run when I am lucky. How's that fair? Gameforge, please adjust the drop rate and make it group loot.