I suspect the common thought is that MSP “is to track what you plan”. After all, it is a project management software.
I would agree that one purpose of MSP is to track what you plan, but I also believe MSP can be used to actually build your estimate. I’ve actually done this in the past.
I’m a surprised how resistive estimators are to consider using it and also how unreceptive the project management community is to the idea also.
I will be pushing the concept further within our organization but I must admit purchasing a canned package estimating tool off the shelf has an attraction to it when compared to the challenge I seem to be facing in changing people’s paradigms.