There is no FCC rule stating that 146.52 must be used as a calling, then move frequency. Older hams will cry tradition, but they dont realize that old traditions die with old hams, then new hams get to start their own new traditions.
Every area will do something different. There is no universal right or wrong. The basic rule applies, be respectful and courteous, and never willfully interfere with someone.
With all that being said, in my home area, 146.52 is used by the more tradition hams. So I steer clear of there if possible, but sometimes I monitor from my base in case an out of town ham happens to pass through.
The group I run with is switching over to NXDN UHF, and with that we are only running Icom commercial UHF mobiles and HTs. Me and a friend talk on 446.000 analog on the drive to work, as we're only 10 miles apart during the drive. There are a bunch of 2m repeaters around, but none of them are ever used.
When I travel, I follow the wilderness protocol. My VHF scans 52, my UHF scans UHF call, and my 6m sits on 52.525, then I have the scanner for public safety.
Steven KC9GMX