Reviewers mostly see WhatsApp as the default daily communication tool: simple, reliable, easy to use, and strong for group chats, voice notes, file sharing, and voice or video calls across mobile and web. Several mention privacy through end-to-end encryption, though some still worry about data sharing with Meta. The main complaints are weak desktop and Windows apps, buggy calling, backup and sync friction, spam, and limited customization or advanced features like scheduling. One founder from says customers often prefer it for instant support.