FWIW we ended up in business software after one of our open source libraries to read and write spreadsheets (https://github.com/sheetjs/js-xlsx, demo http://oss.sheetjs.com/) ended up garnering lots of demand from businesses looking to build those "proper" applications
Still true for many people in 2017. @patio11 probably said it best:
> Every spreadsheet shared in a business is an angel announcing another SaaS app still needs to be built.
https://twitter.com/patio11/status/655674551615942657
FWIW we ended up in business software after one of our open source libraries to read and write spreadsheets (https://github.com/sheetjs/js-xlsx, demo http://oss.sheetjs.com/) ended up garnering lots of demand from businesses looking to build those "proper" applications