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For example because it's kind of homoiconic. Since everything is a string you can define your own control flow constructs for example...

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If you define your own, say, repeat-until loop, can you use the built-in break and continue commands? Could you define a break-with-value command for the built-in loops?

Using Tcl exceptions, I guess it would be pretty trivial to do that.

Here [1] is an alternative do..while loop implementation provided by Tcllib, written in pure Tcl.

[1] https://core.tcl-lang.org/tcllib/artifact/4f7e97706ff67a40

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