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In new canon, is Yoda still considered to be the most powerful Jedi EVER (up to ROTS), or is he just considered to be the most powerful Jedi of his ERA?

I think he is the strongest ever

https://i.imgur.com/JTxNH5J.jpg
"There were many famous Jedi throughout the years. The wisest and most powerful Jedi of all was Grand Master Yoda."

-Journey to TLJ: The Power of the Force

What about Luke?

Prime Luke should have absolutely been above Yoda, given that he was already equal to Vader as of RotJ.

Yoda will always be the Grandmaster for me but sooner or later Disney is going to create a character that will surpass him.

Well no past character can be stronger than him at least? No one in the high republic can be as strong

^ Not unless they retroactively retcon things.

As of now, Yoda was the most powerful Jedi in history(up to RotS at least.)