Kodi has one of the most arcane UIs I've used in years. Also, you need to find and set up plugins to get streaming going and this is a complicated process. The streams can be good but not worth all the hassle.
The plug-ins are NOT part of KODI’s core functionality.
Although it could be argued the native stuff are plugins too, they are built on the same framework but source your media from locally attached storage (USB, SD card, HDD) or network server/stream (RTSP, SMB, FTP).
YouTube and twitch plugins work well for me.