Replacing a table saw with a circular saw (bad analogies abound) doesn't remove the opportunities for losing appendages. Especially for those who don't learn how to use the tools put in front of them.
"It is impossible to make anything foolproof because fools are so ingenious."
Yes, Git is a sharper tool with fewer blade guards than other version control systems, including HG. That sharpness and relative lack of safety mechanisms, however, lets you do things you can't in other systems. The real problem is that folks use these tools without attempting to understand them and cargo-cult onto a workflow which leaves them open to screwing things up.
To continue the "git off my lawn" moment - I've had to use the reflog exactly zero times in the past few years, despite using rebase locally on a fairly frequent basis (and sadly remotely to fix other's bungles as well). This is only because I respect git for its sharp edges, and when it comes time to re-write history with rebase, I work carefully.
https://www.mercurial-scm.org/wiki/Phases