Thank you SE: WHM is fine where it’s at.

[Shurrikhan]

but it definitely isn't recommended anywhere in game.

For that to matter, there'd have to be more than the barest basics recommended in-game at all.

Whether slide casting is an intended mechanic or not is wholly irrelevant. It's not prevented and sees significant rewards when done.

It'd be great if they embraced that and made it more consistent. It'd be ironic, perhaps, as the whole mechanic was likely born of the same netcode mess that makes it inconsistent now, but it'd be an improvement nonetheless.