A great motherboard for most people - it combines features, likeable build quality, with 2 question marks that will become apparent over time.
1) The pci express next to the graphics port will be covered by the graphics card 99% of the time, so practically it will always be useless.
2) The vrm does not have coolers on top, so I reserve judgment on the degree of overclocking that can be achieved.
However, you don't just get the b550 for overclocking, but for the most common mainstream features of the AM4 platform - and it does great there since it doesn't lag behind anything significant in everyday life!
I recommend it for a simple, practical build, without too many bells and whistles - with a good Ryzen 5/7, 16 gb ddr4 3200+, a recent pci 4.0 gpu, and an nvme2 ssd on pci 3.0/4.0, you're all set - it just doesn't have built-in wifi/bt, thunderbolt/usb c, coolers, and some other fancy effects that not everyone uses!