So much about "expensive weaponry", so little about "effective weaponry". If your tool (in this case, of war) is described in terms only of its cost and not of its effectiveness, you may have a commodity fetishization issue going on there.
There's a reason the AK rifle is the most popular in the world, and it's definitely not its massive price tag.
Sources said Ukrainian troops had repeatedly abandoned Javelin missile command launch units (CLU), which can be re-used and reportedly cost more than $100,000 (£80,000), on the battlefield as Kyiv’s military allegedly retains a Soviet-style, semi-disposable outlook towards its equipment and weapons.
This reminds me of gun nuts being in more danger than normal folks in countries where guns are illegal because they're so valuable.
Russian doctrine
Emphasis on massive firepower over manoeuvrability and precision attacks. Although units do support each other, they do not prioritise coordinating assaults with rapid, spontaneous cooperation. Troops are often of lower quality, who will push forward frontally in order to probe weak spots or get masses of cheap artillery into a better position to grind the enemy down gradually.
Nato combined arms
Troops are trained to a high-level to be able to understand the entire battlefield and operate in coordination with air, armour and artillery on the fly Commanders get troops in flanking positions by using fast communications and high-tech weapons to rapidly and accurately strike threats as they appear. Emphasis is on speed, aggression and outmanoeuvring the enemy.
I may be completely ignorant on battle tactics and doctrinal differences between modern armies, but on a very shallow read I don't see the advantage of needing to train troops to a "high-level to be able to understand the entire battlefield" "on the fly" compared to a doctrine that supposedly relies on less training for troops and mass produced heavy weaponry. Not saying one is necessarily better than the other, but this framing is not helping NATO.
If one were to be snarky about this, they could say that basing your strategy and tactics on the unfounded belief that your people are inherently superior is not a healthy idea.