*sigh*
If 8.2.5 was the literal end of the expansion, it would've been marketed as the final patch. And if that had been the case, it would've been far more likely that they would've delayed 8.2 by a lot and have the features of 8.2.5 released with it rather than now, at which point they're following the release schedule of Legion.
There will be an 8.3. And still, I bet we'll see this exact same void-of-logic-reasoning being thrown around for 9.0 and beyond too.