The option set_string_names_on_creation set to false reduces the time to create the model at the cost of not having the names in the model available after solving. Most of the cases the user don't need the names, however, it is useful to have the names during a debugging stage. That is why it should be an option for the user.

More information here: https://jump.dev/JuMP.jl/stable/tutorials/getting_started/performance_tips/#Disable-string-names