Consumer software running on a consumer OS should not be grabbing all available RAM just because. Doing so will cause other applications to be moved to swap and have to be loaded back into RAM when the user goes to use them. In a server environment doing something like running a SQL server it would make more sense to grab all available RAM and start aggressively caching frequently accessed data in RAM to present it sooner with the assumption that the server's primary role is to perform SQL operations as quickly as possible.
Specifically with Photoshop what would be the benefit of it be aggressively reserving RAM beyond what is needed to function?
Consumer software running on a consumer OS should not be grabbing all available RAM just because. Doing so will cause other applications to be moved to swap and have to be loaded back into RAM when the user goes to use them. In a server environment doing something like running a SQL server it would make more sense to grab all available RAM and start aggressively caching frequently accessed data in RAM to present it sooner with the assumption that the server's primary role is to perform SQL operations as quickly as possible.
Specifically with Photoshop what would be the benefit of it be aggressively reserving RAM beyond what is needed to function?