Windows built-in tools be like "Sorry, can't help with that basic file operation. Would you like to upgrade to Premium™ for $49.99?" Meanwhile, 7-Zip just silently handles everything from DMG files to ISO mounting without ever asking for your credit card or bombarding you with "PLEASE REGISTER" popups.
The stark contrast between native Windows functionality and this humble, free utility is why developers worship at the altar of 7-Zip. It's that reliable friend who helps you move apartments while Windows is the guy who "would totally help but has a thing that day."