Well, with the earlier Zeldas....
Zelda 1, with the exception of Gohma, nothing ever glowed or stood out in any real fashion, since it was only early NES 8-bit. The first thing you'd try is the sword, since its the primary weapon. Most of the time it works, so there's nothing more to it than that.. But with things like Gohma, you hear the clank sound, and assume to try some other weapons.
Zelda 2....well this is a unique beast, so I wouldn't base my judgements on this good, but terribly flawed game.
Zelda 3, with the exception of the boss in Turtle Rock, nothing was ever really in your face obvious. You try the sword first like usual, and most of the time it works. Then you try greater damaging weapons like the bow, and lo and behold, they work too. The first time I played this, for example, I had no idea the Armos Knights could be killed in just three shots of the arrow, since the sword also worked. The sword just made it take a lot longer.
Zelda 4 is when they started to announce the boss weaknesses. Moldorm's Tail, the clown that doesn't shut up about his vase, and the Angler Fish's glowing face.
Zelda 1 gave hints about the boss weaknesses through NPCs, but they were somewhat riddleish, to get the player to think. It wasn't "HIT HIM IN THE FACE," but more like "Strike that upon which the eyes gaze." I'd be fine with reverting to something like this, rather than having so-obvious-it-hurts weaknesses.
Edited by Koh, 04 February 2015 - 08:00 PM.

