For me at least, the big takeaway from the new update with switching to volume pedal blocks instead of gain blocks, is that it can control multiple volume pedal blocks, at least from what I saw in the video, where you can add instead of just swap what you're controlling. Gain blocks, I was only able to control one of at a time.FWIW, you've been able to bind 'other' parameters for a while now. The new add here is really the dedicated wah and pitch blocks. The volume is more convenient, but you can use the gain block the same way...
I realise that it's a niche use, but I run my signal chain in parallel, and I wanted to have the volume control after the amps, which meant two separate gain blocks, only one of which I could control at a time. This means that I'll be able to use a single expression to control both, which is very welcome.