I agree with the opinions but how is it insulting is still something I'm not understanding. Being underwhelming and being insulting are two very different things: Heck the Yuyama thing makes it clear it was made with considerations towards Ash's character in mind, it's just they thought the open ending and not giving any climatic arc was the way to goI don't think there's anything wrong with the finale, however, the preceding 10 episodes did seem lazy and uneventful considering how important Ash and Pikachu are within the franchise.
I mean the writers had the right idea with having him rotate a team with reserves and casually travel around and I have no issue with the casual storyline like the Squirtle or Lapras one for example. Plus, they even executed it well initially by having the OG companions travel with Ash and then have them run into Cilan etc.
Plus, considering they are now going out of their way to even bring back Pidgeot; why couldn't they have simply had Ash along with Misty and Brock, travel across the world to meet Ash's Reserves and also have one of his previous companions join them for a casual quest each episode?
The finale honestly does feel insulting to the character especially considering the preceding episodes.