Removing Energy Drain wouldn't solve any problems for Scholar and would just create more issues for the job than it already has. Removing the one thing that differentiates its DPS rotation, however little that is, from the rest of the healers is not a good fix. Dissipation is vastly overstated as a "bad button" by a lot of people, and that's partly because of the 20% healing boost only effecting GCD healing spells, and Scholar only has 3 of those. In fact I'd even argue that as it stands, Energy Drain is the only truly interesting thing about Scholar's kit due to the decision making of using resources on either healing or damage, however little that it is.
Seraph locking you out of fey blessing and fey union is certainly annoying, it makes sense in the context that Seraph is a separate entity from Eos/Selene due to her buffed Embraces and access to Consolation. Granted, this doesn't excuse how annoying or clunky it feels, and personally I'd rather Eos/Selene just stay out and get the increased Embrace/access to Consolation instead of having to time a long animation and work around the fact that Seraph can potentially eat your commands due to her summoning and her going away, but that's just a personal preference.