I really enjoy these projects but it is sad that most of this basic stuff isn't already built into all new appliances. How much extra would it cost on $300 to a

I really enjoy these projects but it is sad that most of this basic stuff isn't already built into all new appliances. How much extra would it cost on $300 to add a small power usage sensor and a basic readout to understand how much energy is being used on different cycles? Also, with modern detergents, you can use much cooler washes than previously but I don't really know. If I have a white shirt with a stain, will it work on 40 deg with some oxi stain-remover or will it still need 60? These kinds of things are mainly ingrained from using similar washing machines for decades so I always e.g. put colours on 40 and whites on 60. If the machine could somehow help me with this (like the Bosch which can control dosing) then maybe we could save a tonne of wasted energy and make our clothes last longer.