Well, thats a big thuddy disappointment. I upgraded from my v2 to v4 for 2 reasons - the LTE 911 capability with fall detection, and that the infograph faces made room for additional complications so that I could get all of my wanted complications on one face and, thus not needing to switch between my exercise face (to get a workout complication) and a normal modular face that has everything I need minus a slot to launch workouts quickly (no going to favorites with an additional click isn't the solution - the favorites is where I store my quick access but not daily stuff).
So finding that my Reminders complication isn't available on the Infograph Modular layout - thats 1/2 the need gone. For the cost of the thing... I think I'll be returning the series 4 watch and going right back to the series 2 - until Apple fixes this mess.
The missing easy complications is a rather large set; <facepalm> Leave it to Apple to create a watch face with MORE spots for complications that is actually LESS USEFUL because of artificial limitations. Apple support was no use there - as they cannot say if the complications missing will be added in a future watchOS update. Oh well, time to return the series 4.
There isn't any technical reason the simple graphical buttons are not available as a complication other than "didn't think we needed to" that I can come up with. Is this more of self centered "why would you want to" thinking?