In all the arguement of ISO speeds lets remember that in fact there's two ISO speds for every film a Daylight ISO and a Tungsten light ISO, this can vary in difference depending of the spectral sensitivity of the films.
No-one complained about the old EFKE (Adox) films speeds. The slowest film EFKE Kb/R/Pl 14 was initially named for its Tunsten DIN speed, this was later changed to Kb/R/Pl 25 the Tungsten ASA speed, however the Daylight speed was 40/50 ASA. This was important at a time when Tungsten studio lighting was common, in recent years Ilford have stopped listing the Tungsten seeds of most of their films.
There are exceptions, films like Ilford Orto Plus still list the Daylight and Tungsten speeds, and because the slower EFKE films were ortho-panchromatic with a reduced red sensitivity the company chose to use the Tungsten speed.
In addition we need to remember the ISO speed has two components the ASA/BS speed and the DIN speed and the standard allows testing by one or the other, so FP4 has an ISO of 125/22º and specifically adds "Daylight", my old data=sheets give a Tungsten speed of 80. Kodak had the ASA component relaxed to allow more practical testing when Tmax films were introduced, they would fail the older standard.
There was a time I was shooting EFKE Pl25 and Tmax 100 both at 50EI, also APX100 at 100E all in DaylightI, then processing the films for the same time often alongside each other in the same JOBO tank, all would print on the same grade paper.
Ian