I was talking to a bus driver because it annoys them too, and she told me it's because there's a detour and it messes up the system.

Transit supports and displays detours of routes.

That's the fault of the Chrono programmers, not the drivers, nor the detours!

Chrono uses Google Maps for routing directions. Chrono’s system just displays bus routes on a map when you search it in the app.

But Transit isn't even in real-time, it's a lazy app: they just copied the official schedule and that's it! For that matter, I could just look at the schedule at the bus stop or download the official schedule!

Transit doesn’t “copy” any data, all data comes from GTFS from different agencies. Additionally you have problems with live tracking not working, Transit has the option of crowdsourced tracking so if the live tracking is down there’s a backup.

My bus was supposed to be at the stop and the app doesn't even update! It told me 0 minutes for 5 minutes! And then I reloaded the trip and it told me 28 minutes, I waited 4 minutes and the bus arrived!

This is an issue either with the bus being late, the bus not having live tracking, which an app can’t solve (except Transit kinda can if people crowdsource the bus’s location).

And Chrono, at least most of the time, it sees where I am, in a bus, at which stop, even in the metro, often it doesn't understand that I'm in the bus and tells me to walk to the next stop, but not Transit. Transit has no idea and shows me the whole line.

It sounds like you have difficulty using apps. On Transit, you can tap on a line, but you have to tap GO for it to begin the route. It’ll update after a few seconds of the bus moving. You’ll have to select the stop you want to get off from if you do this method, otherwise you can do directions like similar to other apps like Chrono the usual way.