As a happy 2.5-year Kagi subscriber, my biggest missing pieces on Kagi Maps are:

1. Transit. I'm in NYC, and Google Maps does a great job of showing the MTA, trains and busses. Every route, all the stations, which trains stop there and when, even where the entrances are. Kagi Maps has no train routes or layers. There's stations, most of them at least, but it's basically the Wikipedia entry for that station. No up-to-date info or routes.

2. Mobile apps. At least half of the time, my maps use is an Android intent for address or directions, which only an app can answer. And the only really good way to get your location and see what's around you.

I don't really notice latency at all personally, but fixing those things might bring my Kagi Maps usage from 0% to like 50%+.

I know, it's probably a pain in the butt to integrate with the transit systems of hundreds of cities for up-to-date info, but OSM does at least have the stations and routes. Not much point trying to beat the official MTA app in functionality, but something is better than nothing.

It's also weirdly hard to get to. Why isn't it an option in the main list of Kagi things? To get there from the Kagi homepage, I have to click on search options, then maps.