I assume potential sarcasm would be related to the difficulty differentiating between similar symbols, based on length, with different lexicographic meanings.
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.
But the point of the new triple-equals ligatures is that they're no longer only differentiated by length; they have three bars instead of two, as well.
> the difficulty differentiating between similar symbols, based on length, with different lexicographic meanings.
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.