Strongly disagree with this based on personal experience in "traditional" spaces that rely heavily on spreadsheets. There's a reason most of the financial industry uses Excel spreadsheets and it isn't because they can't afford to pay for specialized software. Excel spreadsheets are incredibly versatile. Your data format can change a little bit over time and you'll still be fine. With a custom software solution, you're kind of stuck within the confines of what the developers/product managers gleaned from your working process.