Judging from the early returns, it looks like the lack of air power and diminished mobile air defenses will severely hamper the offensive.
Already there are about 4 - 6 Leo's lost and roughly the same amount of Bradley's.
That is about 10% of the available equipment (~60 of each type) for 4 villages.
Of course there are others like MaxxPro, Boxer, CV90, etc. available as well, but those seem to be few and far between (though CV90 is supposed to be available in comparable numbers)
What is "amazing" (definitely not the right word, but not sure what to say), is that the Ukrainian offensive is hitting the kind of elementary basic defensive strategy you would deploy even as a simple neophyte (minefields funneling into ATGM and artillery kill zones).
I imagine these must be tip of the spear type probing, but a very heavy price to pay for it.