Comment by j45

It's also about having instant on/switch over.

Firefox does have an excellent setup for multiple spaces, groups of tabs, etc.

I tried once on my old 2018 i9 macbook, and was able to get to 2100 tabs without needing a plugin to unload a tab.

Having tabs organized in groups for projects is really useful. Especially if it can be paired with a window manager to keep groups of tabs ready to go between multiple spaces/workspaces.