Its a KISS channel...
The whole idea of a fireground channel is:
1. NO high powered transmitters off the incident scene- If I call Mayday or for more pressure on a line, my little portable doesn't have to compete with a mobile 5 miles away (that can't hear me), or a base 20 miles away (that can't hear me either).
2. No infrastructure, no repeaters, no digital, no trunking, etc. Just plain old vanilla analog from me to you within a 200 yard area with few point of failure. CTCSS is now universally deployed, so it can be used on rx to reduce interference.
3. Reuse of the same channel 10 miles away because of 1 and 2, above.
If you can hit your target receiver with a rock, use fireground. If you need to talk to someone miles away, use your command channel. If you are doing operations, use fireground and don't worry about anyone off-site walking on you. If you're Command, remember that every white helmet comes with a radio for each hand.