It was a logical idea poorly thought-out and executed, it relied heavily on German misconceptions about the French and while there are similarities I think Bakhmut is entirely different.
By not giving up Bakhmut the Russians have gradually become fixated on taking it, they have funnelled men and material into a small area and taken massive casualties but in the process they have entirely forgotten the rest of Ukraine so an entire movement period (winter) where Russia still had material and manpower superiority has been focused on a 50km stretch of the frontline and achieved nothing.
Now Ukraine gets 2-3 more months of training through spring and western material while Russia gets to fill the gaps with yet more mobilised dumbarses with even less training and equipment.
What should the Russians have done ?
1 Doing nothing was politically impossible and militarily the results would have been negative .
2 A blitzkrieg ?Their attack last year was a failure :it did not result in the surrender of Ukraine .Besides :even if a mobile warfare has results, it can't force Ukraine to surrender .
3 Bakhmut :the Russians suffer big losses but this is not important :if Ukraine gives up,no one will remember these losses, if the war continues,Russia can claim that Ukraine also suffers big losses and that Russia can afford bigger losses than Ukraine .
4 Bakhmut is a new Verdun :Verdun had as aim to break the will to fight of the French population .That it failed,does not mean that the decision to fight a war of attrition was bad,as Germany had no other serious option .
Japan did the same as attrition was the only option to force the US to negotiate.
The Bahkmut battle has the same aim :to break the will to fight of Ukraine .
If there was a better solution, Russia would have chosen this solution ,but choices in wartime are not determined by what is better,but by what is possible .
If Russia has material and manpower superiority ( an almost meaningless conception ) ,what should it do ?How should it use this superiority ?
If the battle of Bahkmut fails to break the Ukrainian will to fight, but makes it impossible for Ukraine to start a big offensive to expel the Russians, was it a'' good or bad '' decision ?
And even if it is a bad decision,a bad choice , is there an alternative ?
It was the same for Verdun : a victory in the east was impossible and even if it was possible, it would not give Germany a total victory .
Reality is that Russia has only one choice : to be able to fight longer than Ukraine .