That a building collapses during a fire before it reaches 100% does happen, if your building was already in a poor condition when the fire started. Fires significantly accelerate the wear&tear metric. So it would collapse rather than burn down, technically speaking, although in practical terms the result is the same.

To your second point. As fires progress they seem to accelerate. It wasn't your weak engine's fault. It just wasn't able to stop the natural progress of the fire.

The progress bar is misleading then, in both cases. It's kind of useless if it doesn't give an accurate guide to when the building will be lost.

Also, with the second point, the speed seemed to dramatically increase at the point the engine arrived. It wasn't a smooth increase.

Yes I guess you could say it's misleading. On the other hand, it's a fire and I don't mind a level of unpredictability (for realism) personally :)

The second point sounds like a bug then. You could go into cheat mode and set more buildings on fire to see if that happens again under the same conditions (i.e. with that one weak fire engine). Ideally record it so the devs can actually see what's happening.

I see your point, and I don't disagree that there is a level of unpredictability with fire, but I think the UI could be improved. It's confusing and frustrating for the user if a building collapses at 70%. it looks like a bug, even if the functionality is intentional.

Maybe there could be two progress bars, one for the fire, and one for the building structure.
Or perhaps it could be made more clear that the progress is not linear - remove the progress bar and instead have text descriptions:
"Small fire has started"
"Fire spreading slowly"
"Medium fire affecting half the building"
"Fire spreading rapidly"
"Large fire affecting the whole building"
"Building structure failing"
"Emergency! User death imminent!"

Process of fire IS linear. The problem was that the building ran out of stability before it burned down. So the progress bar is just fine, it tracks progress of fire (not stability).

Well, as I said, it looks like a bug, even if the functionality is intentional.

引用自 Greybeard：

That a building collapses during a fire before it reaches 100% does happen, if your building was already in a poor condition when the fire started. Fires significantly accelerate the wear&tear metric. So it would collapse rather than burn down, technically speaking, although in practical terms the result is the same.

To your second point. As fires progress they seem to accelerate. It wasn't your weak engine's fault. It just wasn't able to stop the natural progress of the fire.

I can confrim that the engines somehow affect it. It suddenly goes faster if there are no workers or few workers. I also saw it stop at around 99% randomly and slowly go down before more workers appeared. I have no idea how this is calculated. Strange behavior.

引用自 Fiend：

Well, as I said, it looks like a bug, even if the functionality is intentional.

"Its not a bug... Its a feature!" Why would this be a feature?

It should speed up when an engine comes

The structural collapse is good and I don't think it is bad to have two progress bars. The game in general really needs to communicate more effectively with players. It seems to be the biggest complaint of most new arrivals.