I think it's rather strange to claim that we'd be spending more time doing damage if we had more damage buttons, especially considering that we at one point in the past had more damage buttons and we actually spent less time doing damage than healing.

The actual reason that we spend so much time doing damage is because we have way too many avenues of healing without actually dipping into the GCDs, so we end up spending those dead GCDs with damage spells. Because while "Heals for X" has a limit, a limit which is lowered by the frankly unnecessary amounts of tools we have, "Deals X damage" is only limited by the enemy HP bar, so damage will always have the greater value.

Adding more healing buttons would not solve anything, increasing healing required would also require quite a sizeable increase to even come close to pressuring our current kit.

Another note: Even if we spend 80% or so of our time healing, that's still not a valid excuse for why the downtime kit HAS to be boring. There has not been a single good reason why one part of our kit has to be barebones and boring.