I haven't really used or heard of the others but Spring was already quite good and you really didn't need to think about threads very much. This might help some benchmarks but, again, who is pining for "Spring but with more threads?"
I'm thinking something that would be a clear differentiater such as a multithreaded GUI framework.
Honestly, its way too early. Virtual Threads will need a a "killer app" (in this case a killer framework) to pull in devs.