I did for like a day when I upgraded to 2.7, until I found out that Kea, at the time at least, did not do MAC address based IP reservations, and you had to use the client identifier instead. So all my static leases stopped working.

So I switched back to the old dhcpd. shrug I'm sure whatever was going on (dunno if it was ISC or Kea or pfsense et. al) has been fixed since then, but I can't upgrade to 2.8 without giving Netgate my personal data[1] so I have to switch to OPNSense anyways.

[1] aside, not to say I really blame Netgate, they do a lot of great work and commit a ton to FreeBSD, and they want to stop people abusing that by selling gateways and such with their work on them, but also...man just let me download the goddamn iso. At least let me compile 2.8 from source! The source isn't even available last I checked! I was fine compiling my own QAT driver. But alas...