I think its kind of cool this idea was something I posted before awhile back minus some differences, and while I definitely like the direction this is going in, but there is a few gripes I have mainly with the normal difficulty version.
The Cons:
1) I think the Monsters should be randomized, and slightly more tougher and their mechanics should be on the same speed like the harder version. Not only will this get players a bit more trained, but helps them out in the harder content.
2) While I appreciate the slightly different mechanics with the 1st boss, but I think the 1st boss in each pathway should had been different rather than the same boss. The fun factor gets hurt in this regard.
3) Since you can change jobs during the dungeon run I think this was a missed opportunity to let different jobs have the ability to open different pathways or find interesting things, it would have added a bit more replay and fun.
4) More Reward variety, I've seen the complaints on the forums here about it.
The Pros:
1) The puzzles are decent enough, Its kind of hard to do puzzles these days because of the internet but still I like it was still tried.
2) The Branching pathways to fill up that book was a nice way to get players to try different routes. There has been a lot of arguments regarding how if this was done in normal dungeons people would try to take the path of least resistance, but the rewards here negates that and everything is on even ground. I wanted something like this for a very long time, and happy Yoshida & Friends made the attempt here. I would love this actually start being done for normal dungeons in general!
I would say they should done more branching paths during the first part of the dungeon besides the last half just to make more interesting, but this is a good start.
That is all I can think of atm..I kind of wanted to share this with the JPN forum, but I'm none too confident using DeepL.
edit -
apologies I see there is a dedicated topic on the subject.