This is not obligatory. They're not limiting you.
This is being repeated over and over but it's simply not true. Making you spend more time grinding gold is a very tangible penalty, gold is already tight in the early game and in the late game, items like the clentaminator and solutions are already expensive. Making you have to grind more gold just because you wanted to have a different design for a build is a very real limitation. Why penalise creativity at all?