SSD get mixed signals in the reliability/heat stakes. They do fail, they fail in ways we haven't got used to yet, and so TRIM/SMART is only partially ameliorative.
I want to be there. I'm told they run hot, so incur much the same cooling issues HDD do. I am told if you don't recharge them periodically, they are not reliable offline storage disconnected from power for various reasons.
And of course, there's price.