> Python 2 to 3 took a really long time

It took AdaCore so long to port the plugin system of the GNAT Studio (GPS) to Python 3 (which seems to be a fraction of the whole code base), that even conservative Debian had to remove the whole GNAT-GPS package.

[1] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1082332