Still not a reason not to give this a try. Many people have been requesting more challenging dungeons. For those who want to take the "easier route," let them. I'd even go further and make it to where you don't have to kill everything to advance but if you do, you can gain special items from the monsters that could unlock areas with a hidden boss that drops rare gear/more tomes and provide a different challenge for the dungeon runners. One of the things that I did enjoy about the SB dungeons was that the ones up to the lv67 dropped weapons only obtainable by repeating them. Even if they weren't the strongest, they did provide unique looking weapons.
I know most people complained about Tsuyu, Shin and Nidhogg normal when they first came out but I loved them and thought it was just the right difficulty for a boss compared to the normal dungeon bosses that can be face-rolled.