If you're going to use many icons, then they need to be visually distinctive. That means ditching the flat designs, and embracing colour again.
It is the reason for removing colors and shadings from all icons.
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I would argue that menu icons are more useful than dark mode in several situations.
It seems some monitors now assume dark mode - only the very lowest brightness setting isn't blinding.
If you're going to use many icons, then they need to be visually distinctive. That means ditching the flat designs, and embracing colour again.