It's so annoying. There is an option to change the language, however I have to change it every time I search for something, because the language doesn't get saved
PV needs physical resources that aren't for free or unlimited. PV needs space. Most energy used has still an high negative impact on the atmosphere. Low efficiency somewhere is energy potentially wasted that could reduce carbon emissions somewhere else.
Heating is waaay more efficient with heat pumps. Aviation... Well who can still afford it...
There are other forms of storage as well, e.g. hydro, heat storage, and many more
I'm not saying it doesn't have it's uses, but efficiency is important
True for your new project from scratch when you already sucked up C++ such that you know what&when.
But at this point you know C++ pretty well (including all what you don't want to use, take a look at the CPP Core Guidelines), and using Rust is almost trivial, since Rust doesn't really introduce anything really new you wouldn't be already familiar with.