Oh, those are nice. Cheap and flexible, I might order some, thanks for the link. The thing with the Rpi ready-made cable is you just plug it once at both ends, instead of 40 separate wires to plug and tangle.
Back to DIP form-factor boards, I should have listed the Adafruit Feather series, which is growing rather rapidly:
They are available with DIP pins though they're 0.9 inches wide, which means there are only a few plugboard holes reachable outside them (it might also be possible to use some of the ones underneath. I remember way back, those plugboard were also available with a 0.6" channel in the middle instead of 0.3", for the wide 40 pin DIP microprocessors of the era. I don't know if many of those packages are used any more.