Is it though? If you mean "ground effect=bad" with easy to learn sure, but isn't the hard to master part typically attributed to skill-based gameplay, not your ability to find this information by googling it?
Until I read this dmg deals a percentage of your life per tick here on reddit I just assumed the damage over time just hurt a lot and %less dmg over time taken would help. Does it help though or is it a fixed amount of hp that's removed akin to "true dmg" from other games that can't be mitigated?
I also thought it was a bug that it went through ward before reading about it here.
I'm curious, does research by googling qualify as "hard to master" for you?