Pivot Tables was the last big feature completely missing, which is now available. Numbers might meet most of the spreadsheet requirements, except some scripting requirements. There is Applescript for those who are inclined that way. For my own use cases, I use LibreOffice Calc, even on macos. I started using it an year ago, just to see if it can work at all. So far, I haven't had any blockers, but my usage is probably not so complex.
GNU cash website immediately tells that it is not a Saas and doesn't need to upsell the latest trendy addons, for it to survive.
It tells that it is not "investing" in marketing to eventually turn a profit.
It is not looking for acquisition opportunities or next funding rounds.
If you want to see what a trustworthy website looks like, take a look at SQLite or postgresql or even this website itself.