Unless you lose power in the interim. Flash doesn't have that problem, and normal RAM has it so badly that we rely on Flash to store permanent data and only use DRAM as an ephemeral cache.
The first datasheet I found for a Cypress FRAM chip gives a required power down rate of at most 30us/V which allows it to continue to provide normal operation protecting data. It's a very easy limitation to live with and engineers often deal with far more difficult problems in unexpected power loss than this.
Because dram loses its memory when powered off not because there's some issue with how refresh works. Needing to refresh memory after a read is hardly any engineering challenge. We've been dealing with it since memory's inception.