I guess that 4266 CL19 will be Hynix so you won't tighten the timings much more at lower voltages (lower like below 1.55V). There is also a reason why there is a $200 difference between 3600 CL14 and 4266 CL19.
Personally, I dislike how Royal Elite looks. It's just too much and lost its high-end style for me. Now it looks like an expensive toy. Either way, 3600 CL14-14-14 is available in silver and gold in a regular Royal or Elite series. It will have the best Samsung IC that should run at 4266-4400 CL16-16-16 1.55V or something near.
Another way would be to buy 2 kits of 4266/4400 CL17-18-18 or 16-19-19 kits that have Samsung B too.
There are applications that run faster with 4266 Gear 2 than anything Gear 1. On the other hand, some games run slightly faster with 3600 Gear 1 (even relaxed timings like CL18) than DDR4-4800+ Gear 2. In graphics, rendering or anything like that, you won't see any significant difference.
Even though your motherboard supports DDR4-5333, it doesn't mean that your CPU will work without issues at this memory clock ... or at reasonable voltages. I could stabilize DDR4-5400 on my 11700K but only 2x8GB. 2x16GB single rank could run at max 5200. 2x16GB dual rank at max 4800, 2x32GB at max 4400.
4 modules in your case are only for the looks. You could use 2x32GB DDR4-4400/4600 and it would be fine too.
Extreme/overkill is how you can overclock the RAM and results, that you can achieve. Memory kits in stores don't look as impressive as you could expect.