Budget boards are just that though, budget, and motherboard manufacturers make very little money on them, especially the £40-70 models. The longer thy can make them for, the more feasible it makes them, especially in low volume (like AMD was at the time the B350/4B50 came out), and they cheaper they become over time.
Just because you'd prefer them to release a new board/chipset every year to help solve a minor inconvenience doesn't mean they should or will. What did people do with the B350 and A320 an a 2200G in Feb 2018 when they launched, they updated the BIOS, AMD didn't release a new board just because a few new CPU's came out.