I like this technique, but it seems like the y axis becomes faily useless?

I can see how it would be harder to interpret, though you could argue it isn't really any different than when it's all stacked. You still need to do assess the "length" of each bar, but when they're separated, it's easier to make relative comparisons within a group.

Sure, but when it's stacked the axis at least tells you the value of the total.

Very true! Definitely a trade off, which is why it's helpful to have both.

Suggest to add ISC License. Thanks!

Good idea, done!

Thanks a ton!