Yup, I work at a tech company and our entire finance & billing team is using excel exclusively (I think our payroll/leave system is the only thing not on excel)

Yup, I work at a tech company and our entire finance & billing team is using excel exclusively (I think our payroll/leave system is the only thing not on excel), where every other team uses one system or another. All of the higher ups makes decisions based on docs created out of all those excel artifacts. I have to admit, their productivity is quite good and they are kings at aggregating and graphing data in sexy ways. It would be a challenge to build them something that actually works better and can adapt quickly to changes (the software lifecycle too slow for them and now they have to deal with some developer types to get something done, so skip all that noise and stick to excel).