My problem with Fullmetal Alchemist

If I had to choose a shonen among dragonball z, naruto, one piece or full metal alchemist, I would choose the last option because it is simply much better (although I admit that I also like dragon balll, especially the first part).
Edward and Alphonse Elric are two brothers determined by the abandonment of their father and the death of their mother, which they tried to reverse with alchemy. In an attempt to revive their mother, the Elric brothers break the most important rule of alchemy: human transmutation. Using alchemy as a weapon is a dangerous thing, since it is a magic that charges each act with an equivalent energy level or matter. As a consequence of her daring, Alphonse sees her body fade away. Her brother Edward, who has lost his left leg, also sacrifices his right arm to save his brother's soul and seal it in iron armor. Thus begins his search for the philosophical stone, the only thing that can help him recover some of what they have lost.
The series does not need more than its psychological maturity to capture and be exciting. Apply the very principle of alchemy in the script.
 Each plot and obstacle they face ends up being reflected and has a reason to be in its protagonists.

Cryin’ won't pave a way to forgiveness

Every sin you carve is ever lasting
I’m lost in this maze of emotion
Who am I waiting for?
Again- Full Metal Alchemist opening

Fullmetal Alchemist is both a manga and an anime acclaimed by the public and I have no doubts about its round story, or the charm of its characters, but despite that it has things that frustrate me a lot.
I can't hate FullMetal Alchemist but it really annoys me when they force scenes to no avail or when they lengthen and add unnecessary stresses in situations that are irelevant because of their predictability.
Certain deaths are expected, but there are plot changes that are intended to make some surprising changes that lose their effect because of how basic and boring they are such as the alleged death of Maria Ross.
Beyond all the helplessness it can generate, I must admit that in addition to its soundtrack, the games between ethics and morals on which the series is based are excellent.
Also sinning stereotypes and very basic plot forms in shonen, the anime poses much deeper dichotomies and reflections than we might expect regarding a series of these characteristics and with its supposed type of audience.