I love mini maps for a few reasons -
1) I love the items being on the mini map so I can go retrieve them as opposed to walking/driving/running, etc. down every alley, dirt road, street, etc. looking for treasure chests and collectables.
2) MGSV for example.....I hate it when you mark a waypoint and it tells you the XXmeters of how far it is but because there's no mini map, you have to constantly look at the main map in order to know where you're going as opposed to getting stuck behind a mountain and then have to walk around it.
3) To me, mini maps are the full map but only shows the area that you're in and eliminates the constant need to open up the main map.
4) Simply, also personal preference as I like to know where every collectable, item, etc. is as opposed to going nuts looking for them all or like in Watch Dogs 2 where you have to get close to the item for it to appear.
5) If there's no synchronization that opens up everything, im going to be pissed because I can see what attracted me to Ubisoft back in 2012 with Far Cry 3 is slowly going away and if that happens, I'll simply cut down the amount of games that I play from Ubisoft and in general.
6) I think that every open world game should have a mini map, not a fucking dumbass compass as this reminds me of Madden's play calling. Old and obsolete where as NFL 2K-2K3 had play calling on the full screen which was fucking awesome and way better. This is how I look at the mini map. Besides, a simple on/off option solves the problem for those who don't like it.
But whatever, I can see that for me personally, what I love about Ubisoft games is slowly but surely being eliminated. Oh well.