Anderton
wanna love X3
I just needed to make sure you could not do in x3 what you could in 8.5, and there's no valid workaround. Working on multiple audio tracks and managing gain change, plugins, volume, automation on multiple tracks while you're trying out different ideas, I mean it would get crazy overwhelming
But there are plenty of workarounds. Just because there are volume, automation, plug-ins, etc. parameters does't mean you have to use them. You didn't use them in your video, you don't need to use them with tracks. And if you want to make a change on all the tracks at once, there's quick grouping. But you don't even have to do that.
If you want to process everything and automate everything, you can use a bus as described above. That's a super-simple option; you can also drag your finished tracks into Take Lanes. But based on your video, you're mostly playing around with creating a couple of tracks, not putting an entire song in layers.
Really, as mentioned above creating a track template where everything goes to a bus not only solves what you need to do, but offers more flexibility...in fact it might be faster to drag in a track template than create all those layers. And you can do comping, too 
Regardless, I am VERY glad you started this thread because the ideas contributed by others of having a "scratchpad" track template for doing "layers on steroids" is great, and one that I plan to use.
Watch my 2 new videos I just posted if you may (I removed the menu LAG ones, since the matter got solved by someone's suggestion to clean up my layout file from absenties)
https://www.youtube.com/watch?v=UYZWlBZfvss and
https://www.youtube.com/watch?v=OxBxp4zImwgI had figured out the bus workaround (and more) this morning already working in folders. After 7 minutes of filming myself I came up with this bus routing option.
And to sum things up, it's not a good one!
Why? I briefly go over it in the video, but essentially : because it's exactly what it is, a workaround! And it's more and more things to think about when trying to get creative on different elements or tracks.
Let's say I want to be creative on many tracks like I usually do (I scratch pad on everything from synth to drums to intruments to vocal). That forces me to have one aux per element I want to fiddle with. I don't know if you can, but imagine the session bordello it would be, track management hell at its finest. It's not rare for me
to mess with 20-30 different tracks per project... who's going to have 20 or 30 aux just to audition the audio from EACH AND EVERY AUDIO TRACK through plugins...?
I tried the track template approach and saved a preset with a folder containing 6 empty audio tracks. Not only does it take a lot of time to load this template (4-5 seconds? empty tracks get added one by one?) but you can't save any sort of routing towards a bus that should also be saved if I was to save some time. you still have to manage and manage. Or create a project template with layers and layers and busses and busses. It should be an open, empty canvas where you have total freedom. Even to mess up. Like 8.5.
To me the creative flow is #1. I've done this long enough to know when it's flowing and fluid, and when it's not. If there's too many steps in the process, it kills instinct and ideas, period. It's not a matter of learning new ways (wich I have NO PROBLEM DOING, ever) it's the efficiency/fluidity of that particular way of doing things.
I give up, this workflow is just no good for me, it requires too much brain time when trying to be creative, I don't want to be an engineer when I'm creating. I want to be a kid.
thanx for all the suggestions though -