Why would it be sarcastic? The triple bar is also the operator for logical equivalence, which I guess is where the font authors got it.
For example, dash vs endash vs emdash, etc: ‒ – — ―
If those symbols were used in a programming language and had different meanings, differentiating quickly could be much more difficult than seeing the difference between -, --, ---, and so on at a glance.
The very thing amk_ is praising is that this issue is fixed in both Fira and Monoid by the triple-equal being not just longer but represented using 3 horizontal bars rather than just 2.
IMO it's comparable to a WYSIWYG equation editor vs looking at raw LaTeX - conceptual errors pop more.