If you consistently have more than 1,000 concurrent users, tiered licensing becomes a linear nightmare. At 2,000 users, tiered licensing might cost $30k, at 5,000 users it might cost $75k. With an unlimited license, your cost remains static. If your average concurrent connections exceed 1,500, the unlimited license offers a near-infinite ROI.
Lacks the web-based Admin UI and simplified user management found in Access Server. You can use automated scripts like the angristan/openvpn-install openvpn access server license unlimited