Modern warfare is a real mix. You can't train troops on the complex systems overnight. Giving a gun or an APC to a newbie is one thing. Teaching a small unit how to update its crypto every day, teaching the young officers how to call-for-fire or air support is harder. The Russians don't do those things apparently because they don't trust young officers to do those things.
This is one of those organizational DNA things. The British and American armies have strong resilient NCO cadres which have saved their asses in fights all over the globe. We shared that with the Ukrainians and they have benefited a lot from that. The Russians do not have this NCO class and its made them rigid and inflexible.