I notice that as well but u have to agree that if u take out those 24 extra mats the normal gather which sometime get u 2 item will give u related profession stuff instead of one of those extra 24 mats, same things for the aided gathers. beside those extra 24 items is a waste of space and the misc inventory only have 24 spot and once those are fill u can lose item if u don't pay attention especially people that afk while gathering.
I agree with you on the inventory issue. However, as for getting more mats, that's not really the case. A normal gather gives the character just 1 mat. That hasn't changed. When the event ends, then we'll be receiving at most 1 item from a normal gather once again. Also, notice that when you receive 4 items from an aided gather (lucky spot or not), 3 of those items will always be mats while only 1 is an ingredient. I have NEVER seen a case where I received 2 ingredients at the same gather. That is because they are slated as bonus items. They are pretty common bonus items since they show up on most failed gathers, concealing the frequency of those failed gathers, but they are bonus items nonetheless.