Came here to post something very similar.
I think this episode undermined Luke's character much more than TLJ did. TLJ Luke, as much of a cynic as he was, was the kind of person you get when an impatient but-I-was-going-to-Toshi-station-to-pick-up-some-poooowwwerrrr-converrrrteeerrrrss kid faces real disappointment for the first time, ie a heartbroken idealist.
This Luke I don't know what the heck is going on. How he drank the Jedi cult Kool-Aid after saving his sister and redeeming his father through the power of his attachment is beyond me.
Worst part for me, as an audience member, is that I can't tell if the show is endorsing this philosophy or not. The prequels, as written, are powerful arguments against the Jedi philosophy, but Lucas is on record making it clear he meant it the other way, and if one thing is clear listening to Feloni in interviews, he's trying to stick to old Uncle George's worldviews.
So we get damned lectures about the dangers of attachment from a creative team that can't let a single legacy character go.
Hey, did you see Asoka again? And Cade Bane? Pretty cool! How about that Boba Fett? And the N-1! 'Member?
But attachment is against the Jedi way!