If it works for you, that’s fine. You are right with the monospaced font being limited to the boxes. Jetbrains mono uses ligatures to overcome certain spacing limits. On top of this some characters are designed to connect better to their surroundings, as the „l“ mentioned, which is not just a stroke, but connects to the neighboring characters with the top and bottom strokes.
If it works for you, that’s fine. You are right with the monospaced font being limited to the boxes. Jetbrains mono uses ligatures to overcome certain spacing limits. On top of this some characters are designed to connect better to their surroundings, as the „l“ mentioned, which is not just a stroke, but connects to the neighboring characters with the top and bottom strokes.