"unsafe" binaries

I'm wondering what those "unsafe" binaries are used for. As probably many people do, I'm experiencing severe performance issues with Cronos block import due to the database size. My understanding is that these "unsafe" binaries are meant to improve things. However, they mention they will crash on staking transactions. So, what can we expect from that? A crash once in a full moon or pretty much immediately - IOW, how often will they crash? Related, when will this be fixed properly without the need for "unsafe" binaries?

The issue does not name any files, tests, or entry points. First identify which unsafe binaries and staking transaction paths are involved, then establish how often they fail and what database-size-related block import behavior is expected before defining a fix.

Written by the indexing model from the issue text.