Why exactly are you so mad? You don't like the Gaiden series, but all I'm reading from you is an subjective opinion. No reasoning, just a baseless spite towards a story made for pure enjoyment.
I'm not mad, I'm disappointed.
Naruto's ending was uneven and Gaiden could've been so much more, but it doesn't aspire to be anything but troll of the readership.
What was the purpose of spending 10 weeks/10 chapters casting doubt on Sarada's parentage? What did Kishi hope to accomplish with that?
Why have Sasuke absent from 12 years of his daughter's life, only for them to finally meet and Sasuke tell her to mind her own business?
Why was Shin and the Shin clones created? What purpose to they facilitate in the story? Would anything change if they were removed from the story?
What does Gaiden have to do with the alleged Kaguya remnants, that were stated to be the basis for the Boruto movie villains?
According to the Boruto Spoilers, the alleged Kaguya remnants don't exists, as Momoshinki and Kinishi come from another planet/dimension.
What did Gaiden accomplish?
These questions do not have good answers. There was nothing writable here. Nothing playable. Who cares?