The Energy of Repose boost is far too strong at higher levels and lasts for a very long time. When fully charged at 100%, it lets players clear roughly 75% of their EXP bar effortlessly.

I don't think it is healthy for the game to motivate people to stay offline for long periods and then reward them for playing only until their Energy of Repose runs out. It also heavily encourages players to create multiple alt characters just to park them offline and rotate through them.

There are much better ways to reward players, such as giving out EXP Amulets as quest rewards to encourage actual gameplay. I'm not entirely sure whether Energy of Repose was originally a 1.9 feature or if it came in 2.5+, but at the launch of a new server, it would be much better if players were incentivized to actually stay online and play together. Disabling it initially—with the option to enable it in later phases—would create a much healthier server environment.