So bob, then that is in fact one (maybe only) reason to use a BJT here. I must admit on more than one occasion grabbing a 2n3904 instead of a 2n7000 or other better part just because it was within arms reach. There are also many cases where a MOSFET does not work as good or at all like for current source, bandgap reference, avalanche pulse generator, dual diode, etc etc.
It's like many things that originated half century ago in hobby electronics magazines (remember those?) but still show up in current literature. Old circuits never die, they just keep getting propagated by old timers and picked up by newcomers who don't know any better. Like that great humanitarian and philostopher (apologies Mr Zappa) Bill Gibson said:
"The future is already here—It's just not very evenly distributed."
PS I shouldn't talk being a huge fan of old gear myself. Several tube amps, radios, and other 'valve' equipment. Big collection of obsolete semiconductors. Lots of germanium, even some point contact. Seriously. And don't get me going on 6502 or Z80 (again, lol).