Anders M prefers the index finger for bars and the middle finger and pinky for fretting, it's common for players to explore alternative fingerings based on hand size, flexibility, and comfort. Using the ring finger for fretting is entirely acceptable if it feels more comfortable. Fingering choices hinge on personal preference and adaptability. While certain techniques may require a free ring finger, strict adherence to Anders' fingering isn't necessary unless it addresses challenges or limitations in your playing style. Ultimately, the aim is to find a fingering that enables comfortable and efficient playing.