I propose to have both progress bar and original estimate, remaining estimate and work done visible at the same time. No need to have extra configurations for switching one or the other.
Progress bar is a great feature. Even more so because of its nice aggregation to parent/connected entities. But why do I have to loose visual information of original estimate or work done and see only remaining work?
As much as I value remaining work info more than original estimate or work done, those two are also important ;-).
Related to idea: https://big.ideas.aha.io/ideas/A-I-8035