Hmm…
Well, 1 and 2 are really well outside of OmniOutliner’s wheelhouse. Conditional formatting and formulas are very much an integral of number crunchers, so they are inherent features in spreadsheet software, like Microsoft Excel or Apple’s Numbers, and data analysis & visualization packages, such as SAS/JMP, Minitab or Tableau.
Number 3 is mostly there although you may not be aware of it. Most, if not all, software from The Omni Group support LinkBack; honestly, I can only speak to the feature being present in OmniGraffle and OmniOutliner, as I have no current use for OmniFocus or OmniPlan. Ironically, while LinkBack was created for Mac OS X (now macOS), Apple does not support the capability. Numbers, Pages, or Keynote use a proprietary linking and embedding technology.
Outside of software from The Omni Group, LinkBack support appears to be rather lean amongst the major players. The barely there website for the LinkBack Project lists the software that supports LinkBack, but it appears that the website has not been updated since 2014. As far as task planning goes, perhaps OmniFocus would be an option for you.
I am not a fan of online applications, but as far as Number 4 goes, to the best of my knowledge none of The Omni Group’s software have online versions. I have had “outlines” that bogged down in OmniOutliner despite not being that large in terms of file size, so having the overhead of network slowdowns added to that would be beyond frustrating. That stated… possibility… 🤷🏽♂️ anyone… anyone… Bueller?
While OmniOutliner is an extremely powerful tool that can be used for more than simply creating outlines (in the traditional sense), it is by no means a replacement for task planners, databases, or spreadsheet software.
