ARM is legacy because it predates the open ISA standard.
I am interested in this, even if it is based on legacy ISA ARM, as I would rather a hacker-friendly router designed for OpenWRT.
This is relative to some consumer device off the shelf which is hostile to OpenWRT, needing trickery to just install. That is what I had in my previous location, and I would prefer this instead.
Maybe but I think going with middling ARM chip is more the right call then trying to pursue a RISC-V based chip. The OpenWRT folks don't have the needed logistics chain to distribute this at all, and it sounds like they're leaning hard on both MediaTek and the Banana Pi team for this. I don't know of anyone else off the top of my head that would give a bunch of open source devs working on a niche distro that kind of support.
That said, the VisionFive 2 is available. There's some people on the Openwrt forums working on trying to get OpenWRT to work; might not be a bad idea to reach out to them and see how far they've gotten.
That's a weird way if putting it. By that logic, a current Gen Intel CPU is also legacy. It might be carrying a lot of legacy cruft, but calling it a legacy architecture seems just wrong.
It is very possible to make a great modern implementation of a bad ISA full of legacy cruft; Zen4 is a good example of that. Intel get a participation award for trying.
I am interested in this, even if it is based on legacy ISA ARM, as I would rather a hacker-friendly router designed for OpenWRT.
This is relative to some consumer device off the shelf which is hostile to OpenWRT, needing trickery to just install. That is what I had in my previous location, and I would prefer this instead.