For historical purposes, as in file version control and editing logging. There are occasions when the model name needs to be changed from the original file upload name so having the history comes in handy to track down the original file on my computer or on a 3D editing web site such as Tinkercad. Plus there are Shapeways based editing actions that could change the uploaded model. If you do wall thickenings those steps are recorded along with what wall thicknesses repairs were used and in what order. Changing the size of the model using the scaling tool is also recorded although the scaling factor is not recorded. You should add the scaling amount that was performed by each scaling operation in the history list for completeness. I hope you're not considering removing the history log tab or any other capabilities in the name of simplification.