I run AD at home but it’s because my job is in enterprise software engineering and so running these programs in my home lab requires AD integrations. It’s also needed for HyperV and SCVMM along with things like SQL server auth and GMSA which I can’t get out of testing. Ironically most of my work is in open source/Linux but Windows servers are all over the Enterprise so I don’t have a choice but to run this stuff. No real users on it and just used for the lab.
Could be good as a firewall with PFSense or something. 2.5gb to the ISP and a 10gb trunk port. Would be an upgrade for me. All I would use is a drive in it though.