This is good news but it does then gimp your motherboard support for other CPU's. My B350 has a massive list of CPU's it supports.
https://www.asus.com/us/Motherboards/PRIME-B350-PLUS/HelpDesk_CPU
from what I remember of the 400 series motherboards when they came out the main difference was the way it handled boost being a bit more intelligent and more smoother of how it jumped the clocks up and down, there was also that storageMI that looked like a good feature, but other than that they appeared to be very similar to the 300 series. I'm happy with my purchase from 2017, I went with the Ryzen 1600 and overclocked to 3.9Ghz based on Steve's recommendations and I'm still happy, at some point when the 3rd gen Ryzen's drop further in price I might pick up an 8 core+ CPU, or just stick with what I've got until DDR5 becomes mainstream.
https://www.asus.com/us/Motherboards/PRIME-B350-PLUS/HelpDesk_CPU
from what I remember of the 400 series motherboards when they came out the main difference was the way it handled boost being a bit more intelligent and more smoother of how it jumped the clocks up and down, there was also that storageMI that looked like a good feature, but other than that they appeared to be very similar to the 300 series. I'm happy with my purchase from 2017, I went with the Ryzen 1600 and overclocked to 3.9Ghz based on Steve's recommendations and I'm still happy, at some point when the 3rd gen Ryzen's drop further in price I might pick up an 8 core+ CPU, or just stick with what I've got until DDR5 becomes mainstream.