Where are the traps?!

Anyone else is wandering why they don’t add spring traps and hidden bombs and giant bombs to CR? I think an invisible trap would change alot in game tho it might need some changes for example a spring cant by itself counter a hog but it can counter a firecracker or one or two barbarians we might need a weighting mechanism like in builder base in Coc. I think addition of Prep time to the traps would help too like traps need 3 to 5 sec to get activated and it makes it in a such whay that you need to predict your opponent. And they can make it into passive abilities you can use while using different tower troops instead of being a card because a trap card imo isn’t worth substituting an actual card.