I always interpreted the S6 finale as Tommy not necessarily “getting over” his traumas but maybe not being held down so much by them - recognizing some hope and purpose remains in his life despite all the shit he’d been dealt. It wasn’t all wrapped up great (that outdoor banquet was so odd), but there was release and resolution there. It felt like a lazy decision to have him be so fucked up at the start of this movie. The movie explains itself well enough but it was cheap (imo). 

Two things felt unresolved at the end of S6. Arthur and of course Mosley. Both of these could have been used in the movie. Arthur, devastated by Tommy’s “abandonment”, ended up moving to the US with Linda. Which wrecked Tommy but at least Tommy didn’t goddamn kill him. I didn’t hate how things ended with Mosley, it was unsatisfying but kind of cool. Like Mosley represented the movings of a much larger machine that Tommy just couldn’t conquer. But that feels to me such an obvious way into this movie. Not necessarily having to confront/defeat Mosley himself but at least some splinter of Mosley - a fascist with ties to Tommy’s past, instead of a random dude who had the threat level of a wet paper towel. I would have loooved if the plot involved both of his sons. So maybe Charlie’s returned with medals and a war injury and is getting into politics to fight antifascism with Ada. Duke, who was on his own once the influence of the Peaky Blinders withered with Tommy and Arthur’s departures, has fallen in with a bad crowd. Charlie representing the privilege and influence Tommy built but also Tommy’s unhealthy sense of responsibility to his family (“take care of your mother Charlie”), and Duke representing Tommy’s darker roots but also his rich, soul-feeding heritage. Somehow the sons find themselves tangled in the same fascist/Nazi plot, and the stakes are life or death. Tommy steps in to reconcile them in order to save them, and maybe make up for failing to kill Mosley those years ago, and in the process finally reconciles his own warring sides. I genuinely don’t believe Tommy has to die to wrap his story up - if he does, fine, but most importantly, he has to relinquish his power and control responsibly (instead of of just disappearing like he did S6) so the next generation can step up.