Restraint is not the absence of ideas. It is the discipline to identify which idea deserves the room. In digital products, every element asks for attention, but attention is finite.
The best interfaces establish a clear hierarchy, let typography do real work, and use motion only when it explains a change. They feel obvious after the fact because their complexity has been resolved rather than displayed.
This approach requires confidence. It means testing the quieter option, editing without mercy, and trusting the audience enough to leave space for them.