A pawn is a potential queen (or any other piece you prefer, except the king of course). The great world champion Jose Capalanca was noted for winning a pawn and nursing his advantage into a winning ending. Between skilled players where tactical errors costing more substatial material may be few, it is advantageous to try to gain a pawn to have these winning endgame chances. Of course if the opportunity to gain a greater material advantage arises, that's the course you should take instead. Even gaining a positional advantage, such as doubling your rooks on an open file and penetrating into the enemy position as you mention which could ultimately translate into a material one, is a desireable course of action.

A pawn is a potential queen (or any other piece you prefer, except the king of course). The great world champion Jose Capablanca was noted for winning a pawn and nursing his advantage into a winning ending. Between skilled players where tactical errors costing more substantial material may be few, it is advantageous to try to gain a pawn to have these winning endgame chances. Of course, if the opportunity to gain a greater material advantage arises, that's the course you should take instead. Even gaining a positional advantage, such as doubling your rooks on an open file and penetrating into the enemy position as you mention, which could ultimately translate into a material one, is a desirable course of action.