You didn't really do anything about 4 / 5 much less acknowledge the balancing issues that exist with your solutions. If you have some Healers do more DPS than the others, you indirectly create issues around Healer DPS contributions and raise the expectancy of that, while also forcing devs to build encounters around it meaning that those falling behind will have more issues doing the content on Healer role. There is also a gameplay loop issue with your solutions, they likely can't design encounters around "healing" with an immense amount of damage going out consistently, meaning that people would still get bored on "pure healers".
4) Refers to casual Healers in PF that play it on and off depending on how the "hard" any given tier is. They do not want to have to heal more or do more DPS. This group technically is similar to group 3. These people tend to play the role as an off job.
5) Refers to the fact that we do not have enough Healers in PF currently to meet the amount of parties doing raid content. We need more Healers in PF.