Do developers make their own properties?

Personal opinion: the real estate industry is a mature market, and developers do not recommend doing their own property. 1. External attributes add selling points. 2. Self-organization is congenitally lacking. 3. More and more contradictions have turned to property. For example, the contradiction between self-organized property developers and property will point to property. For example, the construction quality is uneven, which is a lot of trouble.