“Probably not.”
How can you even begin to quantify this risk if you have no idea what the problem is, or if you’ve never actually checked? That’s irresponsible to tell people “nah you being run into this problem” or “Eh, RAID5 works great!” when you’ve never looked into the stats or supported people who end up getting all their data lost?
This is a real problem and anyone not running two drive redundancy in 2020 on data that they care about is going to lose their data eventually.
If they don’t care about the data, then sure it’s not a big deal. I myself have 2 Synologies where I back up one to the other. The backup Synology is raid 5 because I don’t care so much about losing data, but my main drive is RAID 6.