I think now that I've had time to sleep on it, my biggest issue with the ending of Agatha All Along is that I misunderstood the message. They continuously called her the "covenless" witch, but since teamwork was needed to open the road and to complete the trials, I assumed the message was that people need community. I thought that by the end of the Road, she'd realize what she was missing and be given her coven back as the prize for finishing the road. I know she's a morally-grey-leaning-into-villainous character in the comics, so it's not like I was expecting her to be 100% good by the end. But rather, her coven would counterbalance her evil. Kinda like how she was in the trials: working with the group but still always looking for the easy way out, or a way to save herself. The coven trying to rein her in.
I think I deeply misunderstood the character and where the story was going. It was so smartly written at the beginning that I thought it would lead to a well written pay off. By making it so the Road was conjured by Billy, I think it took away a lot of the tight storytelling and where I perceived the story was going. I found the ending that we got deeply unsatisfying as a result.
I forgot it was Marvel, and that they'd shoehorn in a male lead character to set up future projects.
I was focused on the witches. Marvel was focused on Billy.