I’m reminded of a scene in “All Quiet on the Western Front” where Katz tells his boys to watch out for short rounds from friendly fire, because all the German guns had their barrels shot out years before, and their accuracy was garbage.
It's worth remembering that prior to this Ukrainian counter-offensive, the pro-Russian crowd was crowing about the irresistable quantities of Russian artillery rounds raining down upon the poor Ukrainians, and that the Russia infantry just had to walk on it and mop up.
Well...that many rounds chews through tubes, which may explain why we're no longer hearing about the same magnitude of shelling. Tubes are worn out, and they don't have the logistical support to replace them any time soon.