I think arty as a main tank killer is a biased feeling; granted there is a gazillion videos of drone directed arty taking out stuff.
But recording a tank on tank engagement via drone is almost impossible but the few very short range ambushes.
If long range engagement are recorded, what we will see is either the tank firing at something or the receiving end taking hit.
Even if the crew had a camera on board (usually a gopro), we wouldn't see much besides the tank firing or taking hit due to wide field of view of the camera, making the target way to small to see on video.
That is, if the crew puts the video online while on the frontline.
Add to this the ease of uploading drone videos on the internet (since drone operators are not usually direclty on the frontline).
Same is actually true of javelin missile, there is like what, a couple of videos of javelin taking out tanks? Does that mean there is no use of them or that no drone or no one recorded those hits?
My point is, i don't think tank on tank engagement is that rare but there is almost no way of recording them properly.
That said, you are very likely right; i still do have the [i]feeling[/i] arty is the main killer there..