At first I thought you were talking about actual raw read/write speed and how things like ARC or write caches can actually become bottlenecks when using NVMe storage, which can easily get to 200 Gbps with a small number of devices. That's being worked on via efforts like adding Direct IO.
Instead though I think you've fallen into one of those niche holes that always takes longer to get filled because there isn't much demand. Big ZFS users simply have tons and tons of drives, and with large enough arrays to spread across even rust can do alright. They'll also have more custom direction of hot/cold to different pools entirely. Smaller scale users, depending on size vs budget, may just be using pure solid state at this point, or multiple pools with more manual management. Basic 2TB SATA SSDs are down to <$170 and 2TB NVMe drives are <$190. 10 Gbps isn't much to hit, and there are lots of ways to script things up for management. RAM for buffer is pretty cheap now too. Using a mirrored NVMe-based ZIL and bypassing cache might also get many people where they want to be on sync writes.
I can see why it'd be a nice bit of polish to have hybrid pool management built-in, but I can also see how there wouldn't be a ton of demand to implement it given the various incentives in play. Might be worth seeing if there is any open work on such a thing or at least feature request.
Also to your lower comment:
>I am using TrueNAS for my ZFS solution and it doesn't offer anything out of the box to address the issues I am bringing up.
While not directly related to precisely what you're asking for, I recently started using TrueNAS myself for the first time after over a decade of using ZFS full time and one thing that immediately surprised me is how unexpectedly limited the GUI is. TONS and tons of normal ZFS functionality is not exposed there for no reason I can understand. However, it's all still supported, it's still FreeBSD and normal ZFS underneath. You can still pull up a shell and manipulate things via the commandline, or (better for some stuff) modify the GUI framework helpers to customize things like pool creation options. The power is still there at least, though other issues like inexplicably shitty user support in the GUI show it's clearly aimed at home/SoHo, maybe with some SMB roles.