It is a general purpose language. I made a program to minimize the earthworks in highway design. Not bad at all.

It is compiled language. It has some data structures builtin similar to Python. It has (very fast) garbage collection. And it has very good parallel support built in.

C# runs nowhere, not even in windoze.
I used to participate in a project which provided a library to unify the access to certain applications (structural analysis), some of which are free and some of which are commercial. The library was developed in C#. Then, we would use the library to make (structural) optimization code, which would be structural application agnostic.
One of our partners who developed an structural analysis application in C++, insisted on using VStudio 2010 because they said newer versions were not compatible. Indeed when we tried to use VStudio 2017 our library code would not run and had to make changes to the code. The same when we used VStudio 2019 (since then I left the project).
At home, I tried to run the library in Linux with mono. It would not compile. Also, many moons ago, a colleague told me that mikro$oft had made an "free" compiler in Linux. It didn't compile the library - it didn't even run an example of the documentation.
And, please, VStudio is NOT free software. You have to make a mikro$oft account to use it after some time.

Java has the problem of Oracle, a but at least it runs anywhere. I participated in a project 10 years ago, where I worked in Linux, and the other developers in windoze, and I never had any problems.

Then use Python. It does far better protection.

"...data that was stolen..."
It is impossible to steal data.

Don't forget the price. My wife bought an Acer laptop (Celeron, 4GB RAM, 500GB disk, no Windoze) for 225 euros some years ago. It runs Linux (SuSE) perfectly. To take it to the extreme, I ran Linux (Ubuntu Mate) in Raspberry PI 2B. It cost about 60 euros without the monitor. I couldn't be happier with it. I used web mail, I browsed the internet, I watched utube. I ran Office applications, CAD, finite elements analysis. All my programs run without any issue after a recompilation.

The real question is, why do I a need a MAC and MACOS?

This is the most incredible recovery I have ever seen in rockets. It is really impressive that it did not blow up, it is more impressive that it managed to climb after that.

Right. How many supercomputers run windoze?

Where are the MS apologists now? The ones who said that MS is a new, better, company and embraces FOSS etc.

I disagree. The incompatible changes in python3 are few. They were being debated for many years before python3 was made. After python3 was made, you could gradually alter your code in python2, which backported some of the new features, for example the new style print. Python2 was supported for many years after python3 was made. The whole process took almost 20 years. If anything, it can not be better than that. In 20 years I will have retired. 20 years ago someone younger had not finished school or was not even born.

It is his money and he can do whatever he wants with it. He wanted Mir, and Mir would be OSS software. Good. We, in the Linux community, like pluralism. If he had finished it, I would try it and maybe I would use it. I certainly use Unity and I like it. I might be in the minority, but I don't harm anyone using it.
Nobody forces you to use Mir, Unity or Ubuntu. And if you use Ubuntu, it is for free. I don't understand the hate.
It seems that AC has this favorite project Wayland, and wants to force others to spend their money on what AC likes, and not what they like.

I am sorry to hear this. Unity is a desktop I like to play with, browse some sites, make a documents and so on. It is something different than KDE and Gnome and it adds to the plurality of Linux. The majority of /.ers didn't like it, but we will all be poorer without it.
And, no, I don't have the resources or the expertise to take it over. I will probably switch to KUbuntu.

Give the man a break. He does not spend his money in private jets; he uses it to follow his dream about space. He has done incredible work, reusing suborbital rocket 4 times. He is of the mentality to do one thing at time, to make slow and steady progress. Which is fine as far as I am concerned.
And don't forget that he has a contract to build a rocket engine for the ULA. I don't think that the people in ULA are idiots, they are reasonably certain that Bezos will build the engine.
Ok, Musk has accomplished more, but who knows who will prevail at the end.

Maybe you should try modern features of fortran2008, it is clearer than C++. It may even help you write better C++ code. On a side note, how is auto much better than implicit declaration of variables of the 60s where you knew that a variable starting with j was integer?