It's just as capable as #UEFI with a much smaller code base. Fewer lines of code equals fewer potential exploits.
If Forth scares you, some easier (on the human) language could have been devised that transpiles readily to ANSI #Forth. Problem solved.
Seriously, I'm glad you found that helpful and interesting.
Forth is a paradoxically primitive and flexible. It can go places even C cannot. It's a reasonably common challenge to have a student implement a Forth interpreter in a language they're learning.
Exercism has a stripped-down version of this for Bash. https://exercism.io/
In fact, I should probably take that challenge for the fun of it.
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