Not sure if conquest players routinely do this or not... but I had never levied a CS army until the last game (and even then it was only done to unlock the levy Non Madol's army achievement). I do use CS suzerainty as a buffer against my more aggressive neighbor (will suzerain a CS I otherwise don't want just because of the placement against an aggressive neighbor), but have never actually fought their units in battle.
I'm not a conquest player at all, but I am a Suzerain-monger, and so for instance in my current game (as Pericles, with Monty in my backyard) I'm playing peacefully but the second he steps to me I'm levying my boys for sure. Levying units is a great way to build and develop peacefully (provided you're developing your economy as well) and have an answer to aggressive neighbors.
I'm basing my own impressions on consensus best strategy based on forum posts. But I missed 3 years of posts while I didn't play, so there are some odd gaps - first builds will be discussed for eternity. First governor, not so much. So it seem some people like early Magnus to improve chops and later remove the population hit of settlerss. I can really see the appeal of Magnus in a city with the government center to churn out settlers while the rest of the civ produces other useful things. Magnus to chop an early wonder makes great sense. But I have never appointed Magnus as governor (at any stage of the game). Extra science or culture early seems more important to me, but maybe they are right and I am picking the wrong early governor.
I honestly don't chop or harvest that much (basically just to clear the way for districts/wonders or if I *really* need to get something built fast and have no other way to rush it,) But the (probably sub-optimal) way I tend to play focuses on getting that Classical Golden Age Monumentality Dedication, which means I prioritize Holy Sites in a way that better players would rightfully scoff at, but investing heavy in religion early means the era score for Pantheon (Divine Spark unless I'm sitting on a particularly beautiful piece of land, or if I'm, like Gitarja or Pachacuti or Curtin, in which case Earth Goddess if I can get it) then era score for popping the Great Prophet, then for founding the religion, means that getting the classical golden age is better than even odds, especially as I'm otherwise scouting for Natural Wonders, Goodie Huts, Neighbors, and clearing out barb camps (and if I'm in a place to do so, getting the first Galley out there.) So the faith helps me buy a ton of settlers and getting there is worth a ton of era score. It's a synergistic strategy, even if not the best one.
But even with this faith focus, Moksha would never be my first governor. It is *always* Magnus. Because the Provision promotion is essential. Magnus first, the Provision for Magnus, then Pingala wherever he'll be most useful, then Moksha if he can be helpful. I actually don't use Amani that much but will try to neutralize her any time I see the AI using her, of course.