A partial result of this is that lots of kids (adults, too) are learning Python to program Arduino and Raspberry Pi and probably don't even know there are incompatible versions, or potentially even what version it is they've learned.

It reminds me of Perl 5 and Perl 6, although they finally sensibly changed the name of the new one since there should be an expectation of common ground if the name is the same. A number change denotes an update, but when it's actually a different dialect or language, the name needs to be changed to head off problems that should already be apparent when the changes were made.