Mikrotik is a really interesting hardware vendor because they directly support homelab adventures on purpose. Just supporting regular Linux will buy you a bunch of support eg with Vyos and Cumulus. If you want to support routers directly Pfsense/OpnSense aren't impossible to support. But you could also treat them the same way as routerOS as all of those firewalls can be automated. It basically boils down to running a raspberry pi capable of running LXC/docker behind the firewall to help automate it. Most modern day routing solutions have fantastic ways of automating them to integrate them with all of these really cool solutions. And if you wanted to support Cisco's iOS you could in fact use the same logic with ansible or something (eg updating wireguard routes over time and having the authentication process happen behind the firewall instead of in it)