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It is a lot of things, mind mapping one of them - just as you can probably use excel for mind mapping as well (never tried that:) )

The calc part is not missing, see here: https://strlen.com/treesheets/docs/images/screenshots/screen... - it's more basic than what excel has.

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It does have limited calc, but I tend to think of it as more of an afterthought. The scripting is “very incomplete” in the words of the author, consider e.g. https://github.com/aardappel/treesheets/issues/37

Alright, I wasn't aware about the calc feature from the front-page read impression ;)

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