I have not yet seen a video from the Ruzzies depicting something like the sea of rusted steel near Avdiivka. Not even the disasters at Vulheldar last year.

RE meatwaves attacks, I have recently seen a document on how Wagner threw the convicts in front. They had the worst equipment, but also were without radio. There was no way they could communicate that they were being hit by friendly fire or retreating. They would not know where the second line was. Thus, any retreat would mean that they would be fired upon by their own (I guess they did not really have "their own").

On this attack the Ukrainians would fire upon them and reveal the positions. Then mortar and artillery fire would be used in the general direction of this positions. Logically, the first line of Ruzzis was very close, so they were as likely to die as the Ukrainians, perhaps more since they were not digged in.

That's Bhakmut, but now the regular army is trying the same technique, but the problem seems to be that at least Wagner had good instructors and good morale in the contractors. The regulars don't, so they just loose the front troops and achieve nothing.

Look, this technique is not that uncommon, the armies use screeners and in the musket age, they had the skirmishers to "protect the main body of the troops" by putting themselves in the middle.