Why tf would Russia invade Poland?
There just so evil and orcish and Putin is the Jonkler he's crazy but that's okay NATO exists and would Article 5 a war so Putin will never try to invade but we have to be ready because he's five seconds from invading Poland and Finland simultaneously.
It's simple really.
The "problem" (I hesitate to use the word because open warfare fucking sucks) is that the West has been thoroughly brain poisoned by not having seen an actual open, peer level conflict in 3/4 of a century. Since WW2 the West has only ever conceived of war in terms of abstracts or fighting against barely equipped targets.
Five rounds a day for artillery makes perfect sense when your artillerymen are spending 80% of the war bored and jacking off, maybe called up once a day to bombard a small village. The idea of needing to desperately bombard a position for hours to drive a determined and equipped force back is literally beyond the Western mind most of the time.