Ada has a pretty nice set of numerics (Ada.Numerics.*), but the "lack of libraries" is almost a non-issue when the foreign-function interface is as simple as:
Function Example_1(Item : Some_Matrix) result Some_Matrix
with Import, Convention => Fortran,
External_Name => "EX1";
There are a few people coming in from data-science who lament the lack of REPL, while I might do one, it's rather low on my list, though I think HAC is trying for REPL or something like it. (I haven't used HAC yet.)
> Language ecosystems are the thing that matters. I'd rather write Avionics or high speed trading systems in Ada, but data science? Maybe for some very niche problems.
I agree that the ecosystems are what matters, and this alone would be enough to fuel my general hatred of C: the amount of time, effort, and money spent on C, whether "making a better C" or crippling tools (eg text-diff vs real semantic diff) or making "it 'mostly' works" accepted is simply astronomical.