I disagree.i don't watch rebels so i can't speak on that. when i'm talking about the star wars universe it's strictly the featured films just to be clear.
i know that obi wan and yoda was protecting luke, but the way they went out was similar to luke in TLJ which is what i'm trying to get across. they have that connection and a similar story arc. obi wan and yoda ended up sacrificing themselves which is what luke did at the end. they all went into hiding and realized they were insignificant to the bigger picture and they were past their time so it was their time to go. luke's story arc is similar to obi wan and yoda in that he failed, got humbled and was trying to atone for his failure by going into exile and saving the crew at the end. it just took him longer to accept his failure and help out.
this is what i took from luke's story arc; he was a good guy that believed he could save vader and the galaxy and he did. everything was all good and he was a hero until the jedi academy he started was going sour. luke contemplating to KILL his nephew goes against everything he fought and stands for and was his biggest moment of weakness. he learned from the conversation with yoda that you can learn from your weakness, helped rey and learned from her and had an epiphany.
i thought luke having an internal battle with his faith and beliefs was a great way to develop him. he's clearly heads and shoulders above everyone with a lightsaber so shake his faith up and have him questioning the jedi order. may sound corny but it's a great way to explore and challenge his character.
Lukes new story arc is the most similar to Anakins on a fundamental standpoint. Individuals whose failures shattered them to the core so throughly all they could do was wait for death. Only to have faith restored by a young individual whom they save which leads to thier death.
Also Luke goes through enough in the OT that this breaking him just seems contrived to me.