Thanks for that dissertation on modern-life duties.   
Now one point :   
The  problem here is not my computer, nor the other guy computer nor the  fact that Anti-viruses are constantly altering OS whatsoever.   
Pb is : DCS 2.5.0 MP doesn't work.   
Period.   
Many people on this forum and others seem to enjoy putting things upsidedown.   
Once again : DCS 2.5.0 MP doesn't work.   
So you have to understand how bothering to read constantly : 
Did you check this, Did you erase that, what is your configuration and finally : wipe DCS out and reinstall.   
We did all that and more and yet DCS 2.5.0 MP simply doesn't work. 
And it's been 3 weeks now. 
And I, we, pay for that.   
DCS 1.5.8 as well as 2.2.0 did work on the same computers with the same Anti-viruses, same SSDs, same CPUs and GPUs...   
We're not here to talk about computer performances but about the fact that DCS 2.5.0 doesn't work.   
So  being considered as a dumbass or a newbie or 'go for FSX' everytime one  says it still doesn't work is not very professional and a bit  bothering, to say the least.   
Now about the 20 % availability rate of DCS : I have never experienced such a bad figure in any other game. 
That's  why I suggest ED should address this issue, as well as the server  policy. In my opinion it is much more important than trees quality on  Caucasus.