Okay so I wanted to double-check on this before I responded to make sure I was accurate.
Currently, Intellect is the only thing that boosts healing. That doesn’t make a lot of sense, so as of the patch on Friday anything that boosts damage will also boost healing (e.g. Runesmith procs, group buffs, etc.).
As for the general question of why aren’t we exposing more information, it’s on our to-do list. Getting it to show the healing numbers as you heal (just like the damage numbers) is something I really want to happen soon, and I took a stab at it a couple of patches ago but it I noted in the forum post at that time it was going to be a more complicated fix than I thought, which is why it hasn’t happened yet.
Beyond that, I think long-term we’ve discussed having something like damage numbers show up in the output log so people could parse those later to get information like DPS.
It’s not that we are purposely hiding that information, or we’ve made some decision to not show it, it’s just that exposing those values does take some work and it’s just never made it to the top of the list yet, because other things have taken priority (like fixing crashes or core mechanical issues with classes).