I see you havent read early Bruce and Dick and you have some good MBTI knowledge but you don't really have a "feeling" for different types. ENFJ and ISTJ is when their characters has already taken shift, and that shift is ooc and ugly tbh. I know they have been written as mamy things, but i believe our type decides your development through life, and with Bruce and Dick in particular they developed in a process through 70 years without heavy changes so i would always take their Golden/Silver Age types as canon.
Devin Grayson wrote Dick as a Fe-looping ESTP and he seems "idealistic" so everyone types him NF. 40s to 2000 Dick was all about "doing" and "doing something again". He is very traditional and down to earth both in love life and the way he thinks everything. He was softened a whole lot when the 2000s came with weird origin retcons that makes him love Bruce and girls the desperate way ENFJs do. (Fe-Ni) With Early Dick, the reason he keep "idealing" is because he HAS gone through enough bullshit and made mistakes. and he channels those in keeping the fight and forgiving and doing VERY practical things for family. All the while he imitates but still struggles to understand Bruce's way of theorising. (Si) To contrast, Clark is ENFJ. He says "Why you no love me?" . Dick says "Why you no care about your family and no remember our past as Batman and Robin?") He lives "by the book" and his book is Bruce
Bruce has never lived "by the book. prepared for everything" until Morrison and some others wrote him as Batgod and thrown in his "multi universal" past and future stuff. For 60 years , Bruce was THE rule breaker of the INTJ rule breakers, always up to a challenge and will deal with any suprises, and his idealistic ideas are very self-made. He talks and believes more than he "prepares". Also INTJ uses Si too, when they are depressed, traumalised and anxious, since it's our 8th function called demonic. Bar Morrison, the 2000s is when they turns up Bruce's disorder and depression so that's where he used more Si. All in all, "playboy" Bruce was his Se. I'm INTJ and I am not a fan of changes - I mean I WANT changes and Bruce too, but in some cases , like your City being Gotham and being Batman, you can't afford that (you would see some comics show that BECAUSE Bruce was stuck doing the same thing forever that he had depression - and new stuff either, and i can relate to the way Bruce cope (by not coping at all) You would see Golden Age to Bronse Age Bruce chilling while Dick worries back and forth. The Joker gets to Bruce because INTJ and ENTP "matches" better than others, Tim clicks with Bruce because he's also an NT.