I can't reach `]` without moving my hands from the home row. Nor can I reliably find it using my weakest finger without looking down. Then after I've used it, I must re-home my hands before continuing. Don't even get me started on = and +...

But on my Planck, I press both of my thumbs down in their resting positions and the home row suddenly becomes

[{( )}]

(with the round parens under my index fingers).

Can't get much more seamless than.