I am glad you have not experienced data corruption yet, but that is still a risk for any RAID configuration that has a sudden loss of power. And considering people use different solutions/configurations for RAID, someone who has an SSD write cache will most definitely experience corruption if the system experiences a sudden power loss in the middle of a file write.
There are only benefits to having a UPS, but the risks of not having one could be severe to some. For anyone looking to use drives in a RAID configuration I will always recommend a UPS that is plugged up to their system to initiate an automatic shut down when there is a power loss.
Our community has users with technology knowledge of all ranges, and I think in general it would do a disservice to suggest directly (or indirectly) to a user who is new to RAID that they do not need a UPS. Especially if they do not have an additional backup of their data.
