You can use as many different apps for yourself but good luck sustaining a community/team/org that requires learning 5 apps for participation, especially when not all users are savvy.
In order to sustain an ecosystem instead of mega-app, that ecosystem needs to be really smoothly integrated, and I know of no good examples of this
In order to sustain an ecosystem instead of mega-app, that ecosystem needs to be really smoothly integrated, and I know of no good examples of this