Whether it’s AoC, or any other scientific / technical computing endeavor, libraries are crucial and this is what I had conveyed in this comment in another thread. Development of good libraries with Fortran is where it gets extremely, extremely difficult.
The extremely slow pace of certain compiler implementations when it comes to conforming with current standard facilities and the resultant slowing down of the language standard with minor revision after minor revision of miscellaneous items lacking a unifying vision, ostensibly for the sake of helping some compilers to “catch up”, is proving rather detrimental for Fortran.