Its a new feature, so let us check if we need by allowing for some more time. If its abused by trolls then we can always disable it.
By the way, the likes given for conversations are not counted towards user's total like count, it is just to acknowledge the other side user he liked it via an alert.
Earlier there were category heads with Sticky Threads and General Threads, now all threads are under one roof. If u can pls divide into 2 category like how it was previously