You cannot seriously think that you need 1:1 parity missile-to-shell in that paradigm. The overall result from the conflict is that the soviet doctrine underperfomed, with especially abysmal results for the IADS part of it.
this argument would work if we could produce missiles in 1:1 parity with shells. However, for any reasonable ratio (say 1 missile for 10 shells) the situations with missiles is even worse! British government has ordered more NLAWs, and they will take 2 years to deliver.
> soviet doctrine underperfomed
That's exactly the scary part - Russian military is a mess, and even in these conditions our military industrial complex is barely holding it together. Mind you we spend 10x what Russia spends. NLAW costs more than a Tesla, takes longer to produce than a Tesla, and uses 90's technology. There is huge graft in the military complex!
Now what will happen if there is a conflict with an opponent that is competent, and is able to outproduce Russia 5 to 1? It will end in massive humiliation.
Hence why Russia has advanced very little since the initial invasion, even with the number of men they are willing to send to their death.
Ukraine has a problem taking their territory back as well, but for different reasons. They don't want to/can't send so many to their death, and have to rely on a large coalition of allies giving them weapons -- who have their own things to worry about domestically, so half-arse or delay support.