Why do people play without increments?

I prefer no increments because the absoluteness of a clear time limit appeals to me. Since I am more interested in chess as a puzzle and strategic/tactical competition than its own skill with incredibly chess-specific openings and positions and concepts to be learned, I like the fact that, with no increments, I have to manage time, mine and the opponents. It is an entirely finite resource, which adds an additional dimension to the game. Where games without any time limit can purely come down to a player's patience and willingness to search for the ideal move for as long as possible, games with a clearly defined one are a much more confined battle of wits. They are less of a demonstration of chess knowledge and skill than games with increments - and that is actually what I like about them.

5|2 and 5|5 are hidden in menus.

3|2 too short for most.

Increments is literally pointless and the games can last so long especially time scramble in endgames

I prefer to know the game is gonna end instead of getting into a stressful time scramble that might last for 20 or more moves.

but then again, I exclusively play 30 min anyway, so it's already very different than Blitz or Bullet.

I hate being flagged way more than I like flagging. That's why I prefer time controls with increment.