(that's the Oct 2nd, 2018 Heathcliff, in case the image doesn't show up <backup link>)
I've kvetched about this before, but I can't help but wonder if the comic sort of hit a peak somewhere between the late teens and early 20's, around when SOLRAD did a fascinating article series on Orangecat.
For example, in the above strip, we see a fairly tight view of the situation, with well-drawn (if simple) art, and a clever, easily comprehensible premise. To be clear, though-- I'm not here to complain about the cartoon going in a gonzo, surreal direction in recent years, I'm moreso a bit chagrined by the art quality slacking off a bit, affecting the overall quality.
You can compare yourself at the archive, which is also a really cool resource that goes all the way back to 2002, about four years in to writer-artist Peter Gallagher's tenure. Notice any differences?
To me, it seems like the camera typically zooms out more in recent strips, with the characters usually being smaller... even a bit lumpier, and more brusquely drawn. Now does that work with the current style? Sure, I can concede that. Just that I miss the superior linework and artistry of prior years, even if it was more of a straight-gag comic at the time. Okay, rant's over. :P
There's been a clear evolution, in any case. I wonder where it will lead...