On modern MLC/TLC SSDs, read-only mode doesn't really exist. The NAND blocks must be re-programmed after a number of read accesses to mitigate read disturb. If anything, mounting read-only is probably a corner case, stressing the firmware's read disturb mitigation.
The tradeoff from worse read disturb characteristics is NAND that is 100x cheaper per GB than in 2000.
The tradeoff from worse read disturb characteristics is NAND that is 100x cheaper per GB than in 2000.