Yeah the hard thing about this title too is your characters are crafted from the ground up in the sense that besides the starting class you can change their class up to 5 times and lv up that specific class where you can take skills from that set when you transfer back to another class. Though can be pretty time consuming to tailor a good character. Makes it more the reason not to get them killed, since its not just a character class that is lost, its something that you took the time to tailor specifically for a task through leveling / class changing.
Which is really why this game it hurts if you lose anyone. For example my party if I lose my archer I literally lost about 60% of my firepower in the team right there and considering she only has 1 LP means anything thats fatal to her is going to be a very very bad day. lol
On an up side other characters left back in the base gain exp too, just not as fast of a rate. So while you will not be totally screwed if someone dies at the same time you will not have the same type of quality either.
Due to the game system being like that it really makes you put a lot more thought into your actions. Also the usual bit with items from the shop being limited in quantities so you cant go wasting healing items and other useful stuff.
While Im pretty sure I posted this in the OT heres a vid of a boss fight against an all ninja party. Massive stress not knowing when the 1HK type of move might occur plus they can hit members in the back row which included my archer. The female elf far right side. On top of in the battle one of them has a move that switches the front / back rows causing even more stress lol.
https://www.youtube.com/watch?v=fdyYJdR7vqk
You will notice how "slow" im actually going while playing / issuing commands since am trying to think things through and make sure I dont screw something up causing an opening for the enemy to kill someone. While it looks like I did not have much issues let me tell you mentally it was stressful, but thats what makes it great.
This title also has the physical / magical resistant type of enemies too.