Some people like to abuse inbalances in game or just attack anyone in sight for exp and then wonder why game is so easy, then there are other that respect story and play along without exploits.
Would be fun to hear what i could have done differently in that situations from one of those internet heroes.
Usually the developers will telegraph surprise attacks.
For example,
In the cave where you are ambushed by 3 frogs, the character walking in will comment that they have a bad feeling, and that they sense something. Also, there is a melted corpse in the path.
Even if one doesn't catch the clues, you still have a regular fight on your hands. If your party is prepared (tank leading the way, high armors, well-prepared abilities/strategies) you can win without having noticed the ambush.
If you want to walk into ambushes without being prepared and win without needing even 1 reload, I'd recommend the Explorer Mode. That's really the whole reason for different difficulty levels. The game can be hard and easy to please everyone here.
