Chests are not worth playing for to earn or even buying them

With the new BE system and how we can gain BE through champion shards getting a champion shard through a chest felt underwhelming and frustrating even if the chest was not a paid for chest so riot promised and supposedly delivered a system where they said if you get a bad drop and set an example of an old skin or champion shard you will be "GARENTED" a much better drop in the chest to come after ,well i would like to say that this is an absloutly fucking Lie and none of that is beeing delivered becasue after opening three chests each one week away from each other i got a champion shard in every single one of them and as a guy who is above level 200+ and been playing league for majority of 4 years now and own all champions that i care about owning them i can say that i dont need aextra BE in my account through chest yet when opening chests which should be "rewarding" i still get the same thing i get from playing three days in a row which is of course is a champion shard which i dont need at all , so when will this damn system be fixed to actually be rewarding for buying or earning chests ?