The tanks are a big deal but from what I understand the Swedish Archer 155mm artillery are a bigger deal than the tanks. Those guns are very powerful and highly mobile.Ukr arty, with drones providing instantaneous target correction, has been pretty devastating for the Russian tanks. (idk how important the precision Excalibur shells have been in this, I believe they did not have them or many of them when they turned back the initial russian attacks). However, they also have been extremely poorly used - cannot do combined arms warfare (exposing the tanks to ambush by atgm's) and weak logistics (so they run out of fuel & parts & ammo).
I expect you are leading to the question: if the russia tanks have not been so valuable then why are is Ukr getting tanks so critical? Modern western MBT's can shoot while moving and move and shoot at night, and Ukr seems to have the ability to provide at least some combined arms cover for their tanks. Which makes them a bit less vulnerable to arty and ambush. But there is seemly a serious question of whether Ukr priority should be lighter vehicles (than MBT's) which would be more mobile and nimble. Both' is probably the Ukr answer, and both seem to be what they will get.
Still, it’s going to be a big help to Ukr to have a couple brigades of fully modern armor.