As a developer myself, I'll assume this is a feature suggestion and not a bug
I couldn't find this mentioned already via search.When zoomed out on a large map, only some of the markups show
Roboport, Electric Network, Robots, Turret coverage, pollution show up.
Trains stop name, player names, and tags do not.
Train stop names and tags especially would be super useful to me. Tagging ore patches as I find them, for example. I'm sure in some multiplayer modes, player names would be good too. Note that you can't seem to add tags in zoomed out mode either, which isn't a huge pain, but not great either.
Recipe icons show, but rather super tiny. I think it'd be useful if they were enlarged to be shown to quickly get a reminder where certain production is.
signal states, I don't think would be that useful.
(btw, tested this in 1.1.6 and couldn't see a bug report in any state regarding this.)