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.