What do you think Current Issues are with Healing in ESO?

As Former Class rep, and the so called healing one, I would like to come back to a favorite topic of myself which is "What are issues with ESO healing currently. With a bit more self awareness, the latest content really show cases healer role. Yet there's still issues that are hidden under the older content. These issues, I think are cost effectiveness of healers in gameplay, along with playstyle conflicts among healers that conflict with improving healer gameplay experience, and latest world design issues.

Cost Effectiveness

Taking a different perspective of why healers are less welcomed in dungeon game play is, because for the most experienced players it's not cost effective to use them.  First healers don't get a great chance to levy excess sustain over DPS/Tank, besides when using purge or siege shield. As such, I imagine if support skills costed more, then it would be more of sustain lost for dps, not to consider using healers. So while 3 DPS runs could still happen the ideal setup for fights would put healers in people's mind. 

Playstyle Conflicts

Some I think biggest thing that holds healers back in gameplay is themselves. It's not so obvious, to those outside, but there's lot of arguments on how one should heal in eso. There's some who claim healers should dps some, while others who say no buffs then not a healer, then pure type of healers who just heal. There's some other types, that you can see from Elsweyr Healer sets that Zos carters towards, but biggest dilemma is how to buff one group without endangering another group. For me, I think issue is simplest if you make healers need to heal more. This way each group of healers can still enjoy their playstyles.

World Design

In the past, I considered self healing issue that healers face, but looking at it more. Worst issue is it not health regain? How is that we regain health in combat or even so fast out of combat? It doesn't give us a chance to use health pots or healers as much as it should for these situations. I just imagine a healer should be one to make sure everyone is ready and healthy for combat... but instead game does it for us. Still there's another issue with world design, that hurts healer's a lot

The Game is not very friendly for healers. Not to mention there's issues leveling to doing content slower then dps, but more so there's no chances to heal allies when roaming around content. I see a missed opportunity where people appericate a wandering healer came to help with content. At last death is either trival or battle scaling makes less risks for people to adventure on.  

Final thoughts

After a little over a year, of analysis this what I have come up for healers. I believe this discussion really points out biggest issues of healers, not just in ESO, but in all gameplay. Still what do you guys think? How do we solve healer problem? Does it actually exist?