In case anyone listening, plz no quantum till replacement for: tab groups, hiding horizontal tab bar when using tree style/tab center, and hiding window title bar under MATE, that as far as I can tell is only possible with hide caption title bar plus addon.

Pretty sure all being worked on and excited for >>speed>> but I'm scarred this transition gonna be really annoying.

Tree Style Tabs have become amazingly slow, this upgrade is a downgrade for me :/