If I forget to unlock my front wheel, I can go about my ways just fine: it's just unpleasant.
I also ride snowmobiles on a regular basis, and if you require any effort at steering (like at braking!), that's pretty much an error: you shouldn't need to do it! And that's even at 60km/h...
Also, I'll be honest I haven't ridden a snowmobile in so long that I don't really have a mental model of it. I'm interested though, Do you think they are a similar experience? Don't they normally have like many more points of contact?
Still, the experience is exactly the same as a 'manual' bike (here's mine: https://www.gazelle.nl/puurnl).
Point is: you need to really steer beyond leaning? You either hit a over-40-degree turn (not uncommon even in Amsterdam!) or you did something wrong. You need to brake? Either an idiot crossed your path, or you definitely did something wrong!