The "comma" is on by default perhaps for hundreds of millions of Windows users. It is not a new thing. I have had it since the first Windows version I used, the v. 2.1. (Or should I write 2,1?) I don't think the manipulating of the locale settings would be a relevant option for many of the newcomers during the "find/try/buy MC" process.
First of all, the newcomers would not even know that it must be changed when they evaluate MC. They would just notice the ugly visualizations.
I could let it be the "dot" on my main MC PC, "the media hub". It has an English OS and it is rarely used with office programs etc. I would not like to change that on my other PCs. They are used with numerous programs and many of them use the decimal symbol extensively. Changing it to dot would make the "comma" decimal key on my numeric keyboards nonfunctional, change too many other things and be nonstandard in my locale.
Somehow every other program I have is happy with the "comma" and I have quite many. Also, the MC10 visualization dll files are happy with it.
This not a biggie, but it is annoying since it worked better earlier.