No, it's much too low. OP shows Pearson's X^2 for their results, but that alone is meaningless. p-value would be the interesting metric. I haven't computed it (although we could from the results) but I expect it to be very high, i.e. it's likely to observe these results even with perfect dice.
The “attempt 2” was literally a state machine implementation which the author rejected because they didn’t know how to do it properly and so did it badly using a bunch of if then else logic.
A difficult prerequisite for that might be untangling a very unatomic codebase into testable chunks. And to determine a feasible "level of abstraction" to write tests for. Testing a full pipeline of a numerical library might be as impractical as testing super tiny functions, because both won't allow you to really work on the codebase.
Tiny nitpick: you actually can pin messages in Signal group chats. It's a pretty recent addition though.
Apart from that, I would have been interested in more details about the author's experience with ~Revolt~ Stoat. To my naive eyes it looks pretty nice. I really like the nuanced takes about the other platforms in this article, so I'd guess the author has some good reasons to dismiss Stoat like that.
Its a bit easier as it can be read-only & static generated. Though there are some attempts to make it possible to reply using the Web interface, like HyperKitty /Mailman 3.
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