Well I like the extra SD card which isn’t encrypted by default as long as it’s external. Then I don’t loose any of my personal media/data etc. when the phone dies.
The OS is the main user of the memory. My 7 year old Samsung alpha did have 32GB but I only ever used 10GB
My FP3 has 64Gb and 14GB used by the default OS, only 3GB by apps.
The rest is on my SD card formatted as external/portable