I did Holy Shield for a long time. but put my Pally on hold as a tank until I got further on my druids and DK.
Finally a month or so ago I came back. Didn’t like the feel of HS and when Blessed Hammer.
For Mythics, I found BH far better to use. The effective mitigation is about the same. HS is around 15% and BH is around 13% on average of my self ‘healing’, so basically even. But for me, having an extra charge of BH is nice as it seems to smooth out my HP generation a bit and removes gaps in rotation if I don’t manage my abilities properly. I can also spam it before pulls to get HP up, or to maintain HP between pulls, kind of borrowing the concept of pooling resources like I do on my DK at the end of pulls. Plus for kiting, BH with consecration talent makes for fairly simple kiting while still getting damage and mitigation out.
The juicy part of HS is the ability to block magic damage. That can be really nice.
But like Virgil said, except for ST raid bosses, I’d miss first avenger too much in M+. That with Divine Toll + Divine Resonance + DT Conduits results in massive shields at the start of pulls when I’m usually most vulnerable. And with DR leggo, I get even more HP generation.
One thing that works for me is thinking of HP kind of like Runic Power for a DK. if I’m low on HP, means I’m vulnerable. I try to pool up to 5 before spending usually so if I do spend I just need one GCD to spend it again in case of a big hit or wanting to get a WoG off in addition to SoTR. Now I’m not saying to pool always. I don’t let SoTR fall off at the expense of getting to 5, but if I have 4s left on SoTR and 3 HP, I’m not spending on another SoTR until I get to 4 or 5. But if I have DT coming off CD and know I can get 5 HP from it, I’ll spend to 0 if I can before sending DT out. Just for me, its odd I didn’t really figure that stuff out until I played my DK again and realized RP was my life bar in reality and starting applying that to my Prot Pal.
With DT, Divine Resonance, and BH, I find my HP generation is pretty plentiful with very little, if any, downtime on mitigation.