This describes large companies everywhere
I encountered oil wells essentially controlled by post-it notes passed around an office.
I distinctly remember reading that the entire bill of materials for building a Boeing 747 was managed in Excel. I have not been able to find that claim since then but it was so amazing to me that I remember it.
It doesn't really make sense as I think about it now, because the 747 design predates Excel by many years so maybe it was BS.
Maybe they found the PostIt notes worked better than whatever software they tried.