>>552671This actually makes them structurally weaker
Look at your fingers with the tips facing your eyes. See how your nails are C-shaped from that angle? It's harder for a surface that's curled at the edges like that to break off because it's harder to bend in the direction of the opposite axis (idk how else to describe this verbally…)
When you trim them at the edges, you remove the part that's stopping the tip from bending forward/backward so it gets wear and tear faster as you're using it (typing, scratching at things etc.)
It's better to just file down the edges when you notice scratches and eat lots of eggs, fish and dark leafy greens so your body can build better keratin