This is exactly the reason of why I consider DDS to be easier than Persona 3/4.
You know that you have to devour in DDS, it's a terrific boost to your ability points, after that you just have to decide which abilities to unlock. Once you figure the order in which to unlock them it all becomes easier.
In Persona instead you have a ton of possible combinations when fusing personas, you can do dual, triple and if I remember correctly even 4 and 5 way fusions. The outcome of the fusion can fail (and if you forgot to save it can be a huge pain), the abilities that can be inherited are very limited in choice (which means that you are forced to give up abilities that you could need).
I don't know, DDS seems much more linear in that respect. Not that it is a bad thing... Also the dungeon design kinda compensates for that...