no abt 3 times a month and also testing servers so once the standard 30gb is complete then its current long winded to keep expanding , just added another 12tb 6tb x 2 so i dont go all in i keep expanding them by 500gb until the user wishes to add more only when and only when do they really need it i will expand , my wife vm , sons vm . security system ,gaming vm/ steam os / and my remote backup linux system for when im away are only upgraded as and when it reduces the want to download and install everything online and in sight
at present i just use separate scripts to expand 500g at a time , for each vm and i also do a copy prior , no screwups ever as the img gets automatically dumped into the 20TB Backup once the script runs again it removes the previous
regarding reducing , thats something you have to fully understand , !! WARNING !! it theres no difference in accidentally removing and removing vm + disk .
truthfully i have never gone down only expanded , yet if a feature would ever exist a double confirm is all thats needed and maybe a backup just incase .
regarding the % of users 5% is not a bad amount of users considering how many use ups settings , the use of CA and installing an incorrect plugin that you dont know how to properly operate can kill a server as quickly as a negative downgrade in vm image . its a setting thats there for usefulness to some not all . its also the users operational knowledge and competency , if you dont know what you are doing and you ^^^^ it up , do users have to go without because of the few that bork their systems through no fault of their own ?