One license for HA setup
It would be nice if it is possible to use the same single license in a high available cluster.
Technically only one machine is really in use, so why we have to use multiple licenses?

We attempted to build a Plesk cluster, and while it is technically possible, it comes with significant limitations. It also requires more servers and resources, leading to high infrastructure costs, making it an impractical solution for end users. Further development would require substantial investment, which wouldn't be justified for our partners, customers, or Plesk itself.
For those interested in adapting Plesk for a failover cluster, we have shared our research and proof of concept. You can provide feedback on our forum under the high-availability Plesk topic.
-- SH