One reason would be that Java hadn't been invented yet.
Yes but they were writing it today.
We have a bunch of SQR programs. You don’t have to declare your variables in SQR. Worst language ever. You can fat finger a variable and it still compiles. It takes forever to figure it out.
Java is mixed case. That drives an old COBOLer like me nuts.
As a computer salesman I couldn't program TV remote but I was selling COBOL systems starting in the 60s, UNIX and Fortran in the 70s/80s/90s, with networking with PCs and various OS and DB systems following, but the big banking systems still have COBOL systems running because of the expense/insecurity to convert.
I'm agnostic when it comes to OS and programing languages since I never really cared about any of them, therefore could sell for/against anything with equal vigor {much like a lawyer, except we provided a real service, unlike the blood suckers}.