In practical Engineering/Modeling, if you have to update 10 parameters
individually, like we all do naturally, and if each update takes 10 mn
to recalculate the entire work sheet, it's not viable. The autocalc OFF
is an option, not so practical either. Some parameters go in pair and
it may crash Smath in between individual update. The compactum allows
changing all in block, conveniently ...

Jean