I don’t know which thread you’re talking about, but it sounds like you misunderstood it.
I’ve never said that leaks can be ignored if they’re small. That’d be bad practice.
But this particular leak is just a side-effect of a Message object sitting on the message queue at the moment when your plugin was deleted. That means that the message never gets delivered, so its payload isn’t deleted.
As I’ve explained on the (many!) other threads where I’ve talked about this, it’s not possible to force the message queue to be flushed at shutdown, and leaking a harmless few bytes on shutdown doesn’t justify the extra runtime overhead of other, more expensive object tracking mechanisms that would be the only way to avoid it.
TL;DR: No, don’t ignore small leaks… except for this one!