Depends on what you mean by grind, to get a "perfect" summon it requires basically soft save scumming.I won't dig into the other stuff, but I REALLY don't get this one.
How is SMT grindy? It is practically the gold standard of a JRPG series where even if you are low level, you can fuse a good pair of demons and solve your problems.
Not to mention, games like Nocturne literally have whole systems in the EXP formulas to prevent grinding.
This is especially true in persona since making a really good persona needs at least a couple of elements on them for attacks.