Renew can be used. The talent gives 10% to healing. This can be used on all the party. Thus its 10% to the tanks healing or the DPS when you know there is going to be AoE damage. Like in ToP before the lich. Salvation drops renew on all targets in a raid or party. You can abuse this fact to get +10% healing on everyone. Then hit Divine hymn afterward for 10% extra on every target.
Flash heal is for emergency healing. Mainly you what to reset the holy word spell as faster as posible. Apotheosis can help you here.
Shield is an instent CD that can be used if someone has a healing debuff or if there is a dot with constant low damage. It allows you to focus on the tank. Its about managing party healing, so you can focus on the tank abd not spit healing. Shield va telant can give a speed boost. This is better than feather, as the target gets protection and a speed boost to escape. Feather is hard to position and dps most times moves away from it. Shield lets the dps pick its own direction and adds some protection.
For PoH it good for MT healing when needed. It is better than spamming flash heal. AoE healing is about the holy word spells. The same with ST healing.
If you have the flash heal talent Trail of light. Then you can heal two targets, with the second getting 35% of the flash heal. This works with heal. This helps if you must spit between a tank and another target. DPS or healer.
Heal is good for low threat healing, were the target wont die soon or recieve damage. The 2.5s cast time can be reduced by FC. With Trail of light you can spit heal with it.
Each time you cast Flash Heal, Heal has its casting time reduced by 0.2 sec and healing increased by 3%, stacking up to 5 times.
Basically an increase in healing for heal and a reduced cast time. Trail of light is the best way to use this heal. You need to keep it at 5 stacks if you can. Heal still takes 1.5 seconds which is the same as flash heal. You can abuse this but this is not a well balanced way of healing. Logs do show AoE heal is more often required. So you will become lock into the mindset one hammer fits all problems. Basically you can replace heal with Serenity and get more healing for the period needed. Then move on to other spells that are more suited.
Other choices offer a more open play style.
Mastery is the most important stat. The HoT is mana efficent but takes 6 seconds to deliver the healing. The more you heal, the more it appears to stack. Its also the most useful stat in sims. Ask Mr Robot states under gear check mastery is the most powerful stat for mythic+. Really you want 100% mastery but that wont happen. You need to balance your stats. Whats called an optimal stat distribution. The best build in the gear check on ask mr robot for mythic+, the graph shows 1206 mastery, 402 crit, 134 haste and 0 vers. This could mean that your build wont have a soft cap of 35% mastery. Ask yourself, what evidence do they have for a soft cap. You wont hit such high mastery levels anyway because gear drops are too low. Just make sure the balance of stats is good. A sim can help you with this.
I would not follow people who cant or dont prove their gear methods. Go with your own build. Experiment and have fun. I have DI as it was the first memory I got. You can go with FC if that is what you want. Many go with these four,
First two are equal.
Flash Concentration = 6,763.92 hps
Harmonious Apparatus = 6,703.03 hps
Most likely equal as well.
X’anshi, Return of Archbishop Benedictus = 6,337.00hps
Twins of the Sun Priestess = 6,163.39 hps
Note: The hps data for three of these items are so close they are likely equal. First two are equal.
Also holy is not seen as the high key spec. Disc is more often talked about as the mythic+ spec. Even so there are holy priests that dont use FC that have reach +20. I found +13 not that hard to heal. Good groups help massively.
Seems you are part of that group. Is this a slander post? That would be against the forum rules. Its very immature.