Re: "SSDs fail at an alarming rate in space"
I think the point the original poster was trying to make is that it's pretty much all or nothing with SSDs - when they fail, it's generally without warning and there's little or no hope of recovery. Conversely, you usually get some warning with HDDs - SMART alerts, bad-sector alerts during scans, physical noises, etc.
(though from personal experience, SMART mointoring has been spectacularly useless when it comes to flagging up potential issues!)