Well, we talk about Berserk, famous story and deserve it, however we must focus on elements the story has, in Golden Age and after Eclipse..
One friend says "Golden Age and Eclipse's events are enough for story(he means the adaptation), by deleting that reversed beginning, and it will fit being excellant story, open ending", i agree with him, because Golden Age in manga has more secrets that must be solved, but here we are, we will look onto elements and compare it.

Golden Age and its major theme is about tragedy, Guts is cursed, friendships, less of unnecessary comedy and more serious events, it has excellant Actions and Dialogues, we can't forget or denying facts, Golden Age is great story itself, elements in its perfect place, it's called realistic, some of you may say "It is a fictional story, how is it realistic?"
I say "Fiction follows srtuction, so there are levels in writing fictions, or i would like to say Fantasy in case of berserk, we can see Plot, Characters' design, writing characters' psychology and levels of community, so we rate Fantasy and Fiction and review them by critical excellent points of the story, also we see events that serve story and give reader more attention, good plots, no unecessary events don't serve story, that's all to be a story with good ending -i don't say happy-, "

However, after Eclipse, Guts and his friends face many events, i see the story had lost its major theme a bit and it changed to be less serious and more comedy, i don't mind existing it, it is necessary to change points of view Guts has, thinks more about friends he has, saving them instead of seeking revenge, but i -at least- see jokes don't fit with story case, espeically after Eclipse that don't fit major theme that time.

Point two, the actions and plots became more easy, iron hand moves freely and it holds Dragon Slayer? Guts falls from a mountain with armor and sword? scary monsters becomes easy? and the most important of them, monsters watch Guts they don't attack as they are supposed, you may see them frozen for no reason for a time watching Guts in a surprising moments and react, it effects on actions get more weak than before

Point three, dialogues became chatty and unecessary that don't build characters and make them strong, draws are more enough than some chatty dialogues

I understand the goals Miura seeks to achieve by building his fantasy and characters both, took 3 decades and half, it is a hard story to write and draw, in despite of it, facts are facts, even if Muira was alive, i don't guess we may witness good writing ending, maybe the best choice that he died before completing it -i don't disrespect his death-, maybe the best choice is left as it is.

The problem is how Guts is supposed to achieve his goal? he has no strength to compare him with God hands, the plot may become more easy that's to break realistic element
some people say "Guts may leave seeking revenge", the problem is how is it built well? revenger and savior are main themes of berserk that's built after eclipse for more than 20 years, how is the writer supposed to throw all of it for Quiting Revenge? however new plot appeared in Miura's last chapters that's about killing god hand, we saw them in Berserker Armor last holder, and reflects in his world, foolish king, in case Guts continues his fight and reach Femto, we may see unhappy ending.

The question is May we see built future event and good writing ending?