There is zero reasoning to say they break the game, they just change the way you think about your base.
That's what I was trying to say, just put in other words. The game about belts and the game about bots are, in a way, two different games. So Factorio as a whole, being, by the very-late-game ...

I don't get it either, I thought logistic network was a straight up upgrade from belts.
I think what people mean by saying that bots are breaking the game, and why devs want to nerf them, is that bots weren't meant to be an upgrade from belts. They were meant to complement belts, just like trains ...

It could work better when combined with some more pseudo-3D features, like train tunnels/bridges

This is so necessary. As for nerfing train car storage, that would be good, but I believe regular storage chests should also be nerfed in some way. Right now chest capacities are absurd for their ...