Zelda's echo ability was a really fun gameplay mechanic. I appreciate the number of players really pushing to create some fun combos and do weird things with echoes
and the way the final battle was structured so that Link and Zelda work together (while still giving Zelda her own phase of the boss that's just hers to deal with) was honestly really cool.
It made them both equal partners as bearers of parts of the Triforce, without diminishing her role. (After all, she's been summoning monsters for the entire game to help her with battles. Only now, the person doing the combat is Link instead of a clone Bokoblin)