LMR400 is a fairly multi-purpose coax. Very handy for base station application especially when talking about VHF/UHF application for 150 ft or less runs. Wouldn’t put it into repeater service (I can go on about why and how it was actually one of the key reasons I left a former employer) but that’s honestly a story that isn’t really important for the purposes of this discussion.
All that being said, when you are pushing power (more than 10W) you really won’t notice a difference when switching to LMR400 over say, RG58. Where it really becomes noticeable is when dealing with receiving weak signals.