Re: 20 years is a lot of time.
"Then why are they still using Python 2?"
because they WANT to! Nun-Ya-Business!
In some businesss you may find Win '9x still in use, particularly for controlling machinery that's >20 years old and there are *NO* device drivers written for that old machinery for Win-10-nic, if for no other reason that Micro-shaft's "driver signing" policies
And why is it YOUR business whether or not people CHOOSE TO USE SOMETHING THAT WORKS WITH OLD CODE THAT STILL DOES THE JOB ???
"UP"grading is _SO_ overrated... if not for the feature creep and API breakage, I'd do it more often.
(quite obviously I don't - I like stable systems that don't waste my time constantly maintaining them, and instead are fixed targets that don't keep moving like Lucy and Charlie Brown with the football.)
icon because, facepalm you'd actually say that