[concede_pluto]

There's an alarming list of behavior MySQL got negligently wrong at some point. That code is mostly still present (you can't prevent a client from enabling it!) and I have to assume some of the maintainers who thought it was reasonable are still involved.

And not everything on the list has a fix available. Off the top of my head, there are still broken storage engines that can't rollback, not all of them can be disabled, and STRICT_ALL_TABLES won't stop you from writing to them. Some foreign key constraints are supported while others are parsed and then silently ignored.

[sambe]

Maintainers often have a perspective that rates backward compatibility higher priority than an individual user would. Even if they have learned from previous mistakes in policy or implementation.