Re: One look at that Deno architecture slide
"That only makes sense in one happy & productive place, Microsoft's IIS dev team"
Seriously? Most unix server side is written either in C/C++ or Java.
"For what _I_ consider a server language (ie. Perl),"
Pull the other one, thats a scripting language, you don't write full blown bet-the-company applications in it. Plus its not the year 2000 anymore, the world has moved on to Python for scripting, Perl is pretty much legacy these days and thank god for that.
"but not for the server language itself but, for supporting modules in decoding, authentication, gaming, etc."
Which are almost certainly written in C/C++. So you might just as well write the whole thing in C++ and be done with it.