i understand your frustration but creating a balanced game is INCEDIBLY hard...
riot first has to test new items for atleast 3-6 months before they can release it.
champions are the most easy to bring out, even then they test for a long time before actually releasing the champ.
maps are the most difficult to create, considering, how it should look like, the thickness of the walls in case of abilities like flash etc, make sure the map is balanced in the way of how long it takes to get to a certain point on the map etc etc..
Riot is busy, it just takes a long time
mean while try out new champs or builds or a new strategy.
fun team comps, try a new class like support or jungle if you don't play those roles a lot.