Notion, ClickUp, Slack, GitHub, Linear, cloud drives, and task managers are all useful. ThinkForge is not here to shame you for using good software.
The problem starts when one app becomes the only place your work can live.
ThinkForge gives your project data a home outside the app that created it. Capture useful context. Search it. Connect it. Run tools against it. Export it again when another tool is better for the next step.
A good integration should give you more options, not fewer.