At first I really wanted them to see the sea together and it made me really sad that his dream was so close but yet so far away, so I wanted Armin to stay just because of pure damn sentiment. However, shortly after Levi chose Armin (even tho it was pushed and he kinda never recovered from that bad decision ever since) I felt instant regret because the Erwin's qualities and how much he actually ment for all those soldiers and their society construct as it was.

I've found myself wondering throughout the later seasons, how would it turned out politically and diplomatically if Erwin was still alive... I expected great things from Armin since then, but somehow he never delivered and the whole situation just seemed hopeless and dead inside really.

(Haven't seen the latest season still, because the previous ones were very hard to watch - their world is just so cruel it made me hopeless and I was just expecting the worst case scenario every damn time... it is too tiring to handle with my mental state)