Concerns about Discard Mechanic

I don't understand why Discard - probably the most maligned supported mechanic - is continually buffed every set.Before a player even gets a TURN, a single mana will:

Disrupt the player's mulligan they took to keep a curve
Reveal a deck's colors/game plan
Disrupt the opponent's ability to interact (due to playing around known issues)
Get rid of a deck's key piece to winning.
Achieve card advantage

Discard, far more so than counterspells, is such bad gameplay/feeling, that most people quit on Turn 1 when a Durress/Thoughtseize, etc is played. I do. My opponent's do. Yesterday, you said you guys are careful to not make Discard so powerful, you create Discard decks. Then can you explain Tergrid? Tinybones? Waste Not? Gutmorn? Fell Specter? Sangromancer? If anything, you guys are pushing Discard, and thereby, pushing the most unfun, players-will-walk environment possible.

A few things:1) Discard is not the most maligned, but yes, there is a segment of the audience that dislikes it. There is also a segment of the audience that very much enjoys it and thinks it adds a lot to the game.2) By “discard decks”, I meant decks that do nothing but make the opponent discard and then use a win condition that takes advanatage of the opponent having no cards in hand (things like The Rack). 3) We do want decks (well, black ones at least) to have access to discard as a tool, but in moderation. Those individual cards can be powerful though.

Black Colors Discard Fell Specter Game Plan Game Play Mana Mechanics Sangromancer Specter The Rack Thoughtseize Waste Not Your Hand