This is widely known issue and it is admitted.
The issues is that there is hardly any forward rendering path to properly render translucent materials.
All deferred renderers have big problems with transparency sorting (in general just rendering it properly).
I wouldn’t expect any big improvements in that area until it will be decided whether it will be best to try to bend deferred rendering to render transparency, implement separate rendering path for forward rendering, or completely moving toward forward rendering.
It’s though choice to decided which option is better as all of them have prons and cons.