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outlawauron said:

Have you played a Persona title? Those gates are pretty identical to what you see if every Persona title. I don't think it's any indication of backtracking. Just that it's blocked progression or holds a boss behind it.

They're present in both Persona and SMT games. Often though you want to go find items within the dungeon before you enter the gate or you need to unlock the gate (in other words: backtrack.)