These are ambiguous words. Use them with caution. Maybe never use them at all.
Clarity is a rare ability. Brevity used well is also uncommon. But, both are attainable. Clarity takes practice because clarity is difficult. Brevity is a rare discipline. It’s much easier to write 100 clear words than 1000 ambiguous words.
What is the importance of brevity and clarity?
Because long-winded writing is boring and people have short attention spans.
Because in a day of obfuscation, meaning is more important than ever.