In their defense, it is likely because most of their base is barely tech literate at best, and if the hardware is their own, they can maintain and update it regularly, lest they end up with a customer keep a router that hasn't been updated in years.
My buddy was using a WRT54G model router for their internet, keep in mind the hardware was almost 10 years old by this point. They were wondering why their internet was craptastic aside from a single wired connection. It wasn't until I visited them that I rebooted their router and the Wifi/LAN miraculously started working normally for the first time in months, and then got them to buy something up to date. Keep in mind this is a person who is a programmer with a masters in mechanical engineering.
good to know this is an innate feature of opnsense