Key takeaway
A single project record is a real consolidation win. Real-time chat and video are a different job, and no tool that pretends otherwise does either one well.
"Can this one tool replace Trello, Slack, and Zoom" is a question people ask when they are tired of paying for and switching between several subscriptions, and it is a fair thing to want. The honest answer is that it depends entirely on what those three tools are actually doing for your team, because they are not doing the same job, and a tool that claims to do all three well is usually doing none of them particularly well.
Two different jobs wearing the same label
Trello is a project system of record: what needs doing, who owns it, when it is due, what it depends on. Slack and Zoom are real-time communication: a conversation happening right now, a call happening right now. Consolidating the first job, getting scope, milestones, tasks, dependencies and risk out of a scattered mix of tools and into one connected record, is a genuine, measurable win, that is tool sprawl actually being fixed. Consolidating the second job into the same product usually means bolting a mediocre chat feature or a basic video call onto a project tool, which nobody ends up using over a dedicated tool that is actually good at real-time conversation.
What's actually worth merging, and what to leave alone
The realistic, honest version of consolidation is not one app for everything, it is fewer places where the same fact about a project can disagree with itself. Keep Slack or Teams for the real-time back-and-forth, keep Zoom for the calls, and make sure the project's actual state, what's due, what's blocked, what's at risk, lives in one place that both of those tools can point back to, rather than being reconstructed by hand across three status decks and a pinned message. That is a genuinely achievable version of "one tool replacing three," it is just not the literal, everything-in-one-app version the question usually implies.