The expression is "chop wood," not "swap wood."
Eagerness to exchange pieces is a classic weakness of style: if you develop the habit of going in for exchanges, it will seriously mess up your game. Euwe even devotes a section to this fault in his middlegame book.
Eagerness to exchange short-circuits the essential positional and strategic thinking process of assessing your pieces. In the opening, if you initiate an exchange, you very often give your opponent increased development or piece activity. And in every phase, it is very important actively to assess the current usefulness of your pieces, to keep the pieces that are most useful to you and exchange off the least useful while doing the opposite for your opponent.
Exchanging to avoid tactics and attacks (which is what you are doing) is addictive because it will feel as if it's working: you're surviving longer in each game--you almost never lose in 18 moves, and you feel you at least made a fight out of each game. Meanwhile, your other skills atrophy. You become like a boxer who only knows how to clinch. The greatest endgame masters, however, were also amazing attackers.
So when do good players chop wood to enter an endgame? Among other times,
(1) When they know that their pawn structure, material advantage, bishop pair, king in the center, etc. will make their endgame objectively better than their middlegame.
(1a) When their king is under a dangerous attack.
(2) When they think certain opponents in certain match situations will perform better in the middlegame than in the endgame. But this is not what it appears. In the Botvinnik-Tal match 1961, for example, Botvinnik prepared openings to prevent Tal from getting open positions with lots of piece play. True, Botvinnik took some early queen exchanges, but Tal started avoiding them, at some cost--as Botvinnik knew he might. Botvinnik also allowed Tal to grab pawns. As a result of all this, Botvinnik was able to tear Tal's head off with aggression in favorable middlegame positions, so that by the time an endgame came, it was a good one for Botvinnik.
(3) When they want to make an equal position clearly drawn by reducing it to a drawn endgame they know how to defend. This supposedly prevents the opponent from muddying the waters too much, but even for grandmasters, it's dangerous. Playing for the draw is often known as "playing for the loss."
(4) When they are endgame specialist club players who have studied and explored the endgame deeply. But you're not an endgame specialist because you lose middlegames--you've just been playing players or computers that are better than you. And you're certainly not an endgame specialist just because x computer program happens to be worse at endgames than middlegames. After you've studied some endgame books thoroughly and played lots of endgames against humans (refusing all draw offers), you might ask yourself whether you want to be an expert a this phase of the game.
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