Haven defense completely unbalanced

I had the same problem as you

I even made feedback on canny but it is not highly voted

IMO game should always give you option to scout the map first and then tactically retreat if needed.

Now I know that it is a “no no” to send 6 lvl 5 soldiers on extreme threat missions. But that to me feels like cheating, because I use prior knowledge of game mechanics to make decisions.