Does it have to be line objects if you only want to display pre-existing wav files? You can do something like the example display by using the waveform images and output it to 3D-squares and arrange those to your liking.
This is one stream split by frequencies, but it should be easily adoptable to multiple files as well. Requires playback to display, but I would guess that's the point?
From the limited data set Apple provided, a somewhat educated guess would place it somewhere around a gtx 1060 (Apple's comparisons was seemingly in regards to the Intel Iris Plus 645). This also aligns with the recommended graphics card for Baldurs Gate 3. This is speculation, but I'll be surprised if I'm very far off (we'll see how well this comment ages in a couple weeks ;) )
The part about accelerating their software is absolutely correct, but that is also the problem. Apple specific software and software using the same hw features (without competing with Apple software) will benefit. As Apple doesn't focus on graphics intensive applications, they have no incentive to improve in this area (which also should be pretty obvious looking back at the last 10 years). I fully expect them to add a "FX engine core" or some other marketing-aligned sales pitch if post fx becomes a focus area though. That won't help generative stuff.
I think going forward Apple will be for convenience and battery, power will be had with Windows/Linux (which both have been on ARM for some time now as well).
After the recent HW launch (nov. 2020) this seems like an ever more inevitable route. Missing eGPU support, portability > power, limited CPU resources and a cost/benefit ratio that is off the charts in a negative way as compared to other solutions unfortunately makes the platform less attractive.
As a cross-platform user it has annoyed me for years exactly how much more resources are available at a much, much lower price-point for PCs than what you get from Apple. The latest offerings didn't help.
I do get that most current Vuo users are Mac/Apple only, but I also would suspect a significant potential for expanding the user-base with a Windows port. From personal experiences, I can say that the more or less exclusive mac use for VJs at festivals in 2015 dropped fast, and that last year ('19) they were more or less extinct. I can't see this changing anytime soon.