New
#11
Windows Explorer is the default file management utility in Windows unless another is installed. It needs to be an appropriate tool with no serious problems for a wide user base, not just home users. As already explained obtaining the folder size by current methods has some serious potential issues when used in a corporate network, and some other situations as well. That makes this feature inappropriate for Windows Explorer. Maybe some other implementation is possible without these issues but only an experienced developer who thoroughly under stands the issues could make that judgement. This is far more complex than most people imagine.
If a user desires this feature they can install a third party utility. In that case the user takes on the responsibility for any issues it may cause.