Here's the thing. Air Forces and drone swarms are great and all.
However to sustain this war, Ukraine and Russia are operating conscription based recruiting regimes, feeding recruits into training programs with 4-12 week training cycles. They're sustaining the equivalent of 1-2 battalions per week KIA/WIA/MIA. Of course their are exceptions, like Azov or the VDV.
How do the USMC or Army operate in an environment like this using the All-Volunteer model where every infantry recruit gets 16 weeks of just Basic. Nevermind specialist schools or AIT? How do you execute doctrine if your maneuver battalions depend on peacetime trained specialists, but are losing a squad or a platoon a day just sitting on the contact line?