I don't think it's really necessary, if you aren't zooming in and out several times each time you are entering a gsme you arent playing it right. You need to zoom in and out constantly, checking names of players, getting the big picture, looking at out post names, etc.
The one thing I will say about the zoom is i think they need to shrink the size of the subs when you zoom in, sometimes it is difficult to make choices and moves. See 2 examples below.
1. You got the guy who sends a row of 2 subs each towards your outpost ever 10 minutes with a total of 60 subs, and mixed in there are some 10 or 1 subs. I would like to be able to target a specific sub or at least know what is coming to know when to make a love nut when you zoom in you can differentiate which one is what. And thats not strategy thst just masking information.
2. When I try and use a pirate to intercept another sub and there are so many things going on that I need to zooM really far in i have a hard time dragging the sub to the right spot, hard to find a sub that 20 hours away on a full zoom in.
Basically, i think it is more difficult to see and make moves if you are fully zoomed in and sometimes you have to zoom in to figure things out since there are so many things going on. And I have a very large phone, i can't imagine people doing this on a smaller screen