For the text being long idk, I feel like it adds depth to the story later on, as for it repeating or appearing when it should not, that is totally possible as the conditions system behind it is pretty bugged and should be fixed.
The final fight can be still done by taking a full hit from the sentry, maybe even 2, especially if fully mastered, idk if you are doing the best sequence of actions but to me it seems like there is quite a bit of leniency, but I can look into making it more forgiving