What makes the MSI PRO B550M-P GEN3 a good choice for budget builders?

It keeps a PS/2 combo port and Gigabit LAN instead of pricier 2.5GbE, which makes sense for a budget micro-ATX board. You still get USB-C at 10Gbps, four USB 3.2 Gen 1 ports, and HDMI 2.1 plus DisplayPort 1.2 for video.