they're holding army groups in reserve because they need to be ready for a full NATO escalation, which is also why they're mobilizing strategic forces.Even if it wasn't well planned, my critique of Russia is mostly about the state of its military
Aircraft are flying blind and then get shot down. Helicopters flying blind without cover. Formation convoys moving in Ukranian roads like they would move in parades in Moscow. Drones/air support is almost non-existent existent
Very few troops committed, only 50k (with 100 on reserve + rotated). They need 200k extra troops to make proper fronts and secure their supply lines
I don't think Russia is making that many mistakes. Note the videos of entire Ukrainian convoys being 'abandoned' (actually, disabled by cluster munitions). There's only claims of mistakes.