I think Aubameyang in last 1-2 years is in bad form and has no motivation at all at Arsenal. This has been his main problem. He is an elite player and maybe moving to Barcelona will open a new chapter and hopefully a more positive one and that we see him playing in top form again.
This observation is interesting, given the news that is now emerging as to why he left Arsenal.
Apparently, Pierre-Emerick Aubameyang clarified that his departure from Arsenal and going to Barcelona is linked to problems with the coach of Mikel Arteta.
Perhaps Arsenal now have more peace in the dressing room. Sometimes these changes have very positive effects.
Actually, I was not expecting that. But nothing to be surprised about in my opinion because Arsenal in recent times has clearly shown that they have much more faith in their younger squad there than the experienced ones.
I don’t know how the transition will affect him, but most likely scoring goals in La Liga is easier than in the EPL, so this transition is beneficial for him. It is a separate question how quickly he can fit into Barcelona's scheme with endless ball control - in the EPL he is used to more intense play in attack, now he will have to rebuild.
Yes, this might take a little time because even the Barcelona squad is getting used to their new play style. But, I expect him to get used to things quickly, at least for Barcelona's sake. Because they need to win consistently.