People regularly ask me whether Zoho One really delivers as an all-in-one platform. My honest answer after a decade of use: yes, but.
The strength is the depth. Bigin and CRM, Invoice, Books, Campaigns, Flow, Projects, Meetings, Assist — all from one source, one login, one data model.
The weakness is the breadth. You can get lost in 40+ apps. Start without a plan, and within two weeks you build yourself a labyrinth.
My advice: always start with the process, not with the app.