I live in excel in a multibillion dollar company as the "excel" guru... though my company doesn't really have big data generally speaking I would love a perfor

I live in excel in a multibillion dollar company as the "excel" guru... though my company doesn't really have big data generally speaking I would love a performant desktop excel replacement - I miss using excel 2003 - it has been downhill ever since... That said, I'm clearly not the target market for this product though I believe there's some degree of frustration with how poorly modern excel works with many files now which this product may address. I would guess that making this a light-weight and performant (not electron) desktop app (ideally portable so installing it wouldn't require admin access) with substantial feature parity and compatibility with excel would be a big deal - I'd install it right away...