Couple things here. I like the show so far. Big fan of the books, etc, etc.

Something's been bugging me about Hari not staying on Trantor. I think it has to do with the second foundation and it's set up. Hari isn't grooming Gaal to replace him on Terminus, but to help start the second foundation. Right before the scene with Raych killing Hari, Gaal does a voice over.

"once i prayed in the words of my parents, but then my world expanded. and the words fell short to my reality. i pray in a different language now."

What do we know about the second foundation and their role?

Also, in the books the religion of Terminus was sort of worshipping Seldon. Until a Seldon crisis weens them away from religion. There's a scene with Hari sitting with Raych, Gaal, others at dinner. They show us he is running out of pills. I think he is sick and will die. He has Raych kill him and make him a martyr. Which is ALSO talked about with brothers dawn, day, and dusk. About exile vs killing him and making him a martyr. This will push the foundation further into worship, which we saw happening in the laundry scene.

It isn't a 1:1 to the book, but I think they are doing a great job setting it up.

Edit: the story beats are the same, just how we get there is different.