Having also some iGPU power is preferable than not and many prefer going with an AMD based mini PC for that reason. NUCs and many mini PCs are advertised also for use in home, we are not talking for OEM boxes that will go in offices and only run office. Also nice options for the kids room, where someone might not want to put a huge desktop.
So it's not just office machines and many manufacturers who where Intel only in the past are today offering AMD based models. Obviously there wasn't a sudden need for stronger iGPU in the office space, but the market fot NUC and mini PCs at home, is significant.