All Kodi boxes using Kodi PVR clients can receive native MPEG-2 streams from servers. My Raspberry Pi TV tuner server software (TVHeadend) has a passthru mode that will deliver MPEG-2 streams using UPnP without any transcoding. As well Windows PVR software such as MediaPortal also have the option of streaming MPEG-2 to a Kodi client.
I had to buy an MPEG-2 hardware processing license ($3) from the Pi Foundation to use GPU cores for MPEG-2 decoding\encoding otherwise MPEG-2 processing in software is terrible. However MPEG-2 processing, transmission and delivery is a b*tch with heavy use of processor and memory resources. Better to transcode and whittle a stream to a third of its size. At least ATSC 3.0 will have MP4 transmission OTA. Recording and storing 10 GB .ts streams eats up drive space fast…