They aren't if they are dying/corrupting. And this is the major issue I have and the reason I've not upgraded.
Reading some reviews that actually do some proper testing and investigations, most of the feedback does not instill me with a great deal of confidence.
No doubt they are faster etc, well aware of that - but losing data is a PIA, rebuilding the machine, intermittent issues... None of this I've ever had with HDD's, and I've got 10 running 24x7 and have for years.