Value of .xml files

I just exported a CA scene as a PNG sequence and then imported the .xml into Premiere. This is the first time I've done this as opposed to importing a PNG sequence and then cutting the .wav onto it. Other than the audio coming along in a .xml import, I can see no advantage in this approach. The sequence doesn't play well until I render and it seems to be a mighty slow render.

What am I missing?

Martin

Early 2009 Nehalem MacPro4,1, 2 X 2.6 GHz Quad-Core

OS 10.11.6

Samsung 850 EVO 1 TB system drive

32 GB RAM

ATI Radeon HD 4870 GRFX Card

Blackmagic Intensity Pro 4K, Driver: 10.8.2

Adobe Premiere Pro CC 018, v. 12, Build 224

Adobe Media Encoder CC 2017.1.2, Build 11.1.2.35

Adobe Character Animator CC 2018 v.1.1.1

Avid Media Composer v. 8.6.1