Yes, so not all games end in a locked drawn pawn structure.
Should En passant be legal?

yes because pawns are also allowed to jump 2 squares. if we want to remove the en passant, pawns should be restricted to 1 square jump also.

En Passant In Chess: Rules, Origin, And How To Use It
"En passant is a special pawn capturing move in chess that prevents a pawn in the fifth rank from being bypassed by an opponent's pawn that moves two squares forward from its starting position. The en passant rule was introduced in the fifteenth century to enhance the pace of the game.
If an enemy pawn makes the first two-step move in chess, you can capture it en passant as if it moved one step. En passant capture is a French term that means “in passing.”
In short, you can use en passant to capture on the opponent’s pawn forward move regardless of whether it jumps one square or two. However, the enemy pawn must be captured en passant on the very next move or you forfeit your chance to play en passant.
Why is En Passant a Rule?
The en passant capture rule was created to prevent situations where the board becomes locked down with opposing pawns blocking each other. This is particularly relevant when a black pawn or a white pawn advances two squares, passing an opposing pawn on an adjacent file.
Without the capture en passant rule, players could exploit the two-square advance to avoid capture, leading to slower and potentially less engaging chess games."

It's in quotes, doofus, with attribution.
You used AI generated text, without attribution and without quotation marks.
Your comment, above, is off-topic and an example of trolling/stalking.

It's in quotes, doofus, with attribution.
You used AI generated text, without attribution and without quotation marks.
Your comment, above, is off-topic and an example of trolling/stalking.
"Should en passant be legal"
Only in the canonical chess variant. New chess variants, new types of turn-based or even simultaneous-turn games can have whatever rules they like, otherwise there is no emotional contrast in creativity, no fun, etc.
But do not try to attack Chess. You were warned!
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