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That's not what T9 is. T9 is predictive text - you hit a combination of keys and it guesses what word you meant.

Here is an emulator: https://www.sainsmograf.com/labs/t9-emulator/

Type `422537` to receive `hacker`. You hit `2` twice to get `ac`, not `b` - and it picks `ac` given the context.

T9 works well for common words. The poor doctor this keyboard(stick?) is being foisted on would not have a good time.

Tweak it with a custom dictionary.

I think the only limit is the time it takes to train a human to write using such keyboard. And perhaps more problematic how bored said human would get, and hence, give up :)

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