tsdb: Any particular reason, why tsl_format_all() is called if a bad sector detected?

[onopche]

Hello, team! I'm running FlashDB on an embedded device with no backup power. Obviously, if a power interruption happens at some point between sector erase and writing headers, the sector becomes bad as it looses some key header data. It makes perfect sense, but in this case on a subsequent fdb_tsdb_init call tsl_format_all() is called that discards all data stored in the partition. I'm just wondering, why is that? AFAICS, tsdb has enough info to carry on regardless bad sector. Thereby only the bad sector could be formatted, isn't it? Or I'm reading it wrong?
Thanks!