The Uber chests has been already reduced in the past. Before you needed like 40k, 50k and 60k to obtain the Uber chest but not much was able to get them maybe the one with 30% skull perk or be a Alliance who was lucky to have 4 wave each round but that was when War Season having 10 and 12 fight. Around the version 3.0.0 with pal Uber chest they have reduce Uber chest skulls needed to 25k,30k and 40k because of the 4 and 6 fight and put uber pal chest at 50k and 60k. More sense like this. So someone with at least 15% skull perk and if they are lucky to have just 2 wave each round. They have 2 Uber Chest guaranteed
Someone who have 20%,25% and more skull perk have 3 Uber Chest guaranteed. So in total in each War you can have over 20 chest easy.
the problem is not Uber Chest but more the low quality of the first chests. the Black one and green are not necessary. Only Blue,Purple,Gold and Uber are valuable.