Without sneaky goblins unlocked goblins are one of my favorite farming troops. Fast, cheap, and efficient. Four housing space (or about 1000 elixir)...
Never on my two priority accounts have I used goblins, however it's because goblins aren't exactly useful when you're a th10 in Champion III and they...
The issue of new major defences being placed during prep day is infrequent enough that IMO, it is not worth the development time to do anything about...