I think in another and earlier thread I've asked if EstiMate users are able to export any or all data in any data type at all. That's a start. I don't remember ever getting an answer.
Seems like good run but the "something new" won't necessarily be difficult really.
A very long time ago I learned Cyrious sign shop software made use of 128 data tables. Cyrious accommodates just about any type of sign and not just wide format. EstiMate accommodates many different types of signs as well. How may tables? I don’t know. Certainly, one can create some tools or even complete apps using spreadsheets but they are not readily found because there happens to be far better tools available to create such solutions.
To glorify spreadsheets one would need to add interfaces to extend the capability and improve the user experience. In the case of Excel, it calls for the VBA add-on, and / or Python possibly. In the case of most work-a-day online subscriptions apps, they demand extensions such as Make (Integromat), etc. Even with UI and UX enhancements, topics like performance, security, and data backup are other important issues to be addressed.
More later.