Chess wouldn't be chess is players would be allowed to change a piece moveset at will when he's in a tight spot.
A better analogy might be saying that all chess games should be timed, because untimed games are too easy.
Then someone else says, why not time your games and let me play untimed games?
To which the response is: if chess games didn't have to be timed, who could then be expected to limit themselves by playing a timed game?
And yet... life doesn't seem to work that way, despite arbitrary statements and confident assertions otherwise.
People who like timed games play them every day. And people who don't like timed games play without a clock.