Even in WWII main battle tanks were vulnerable to artillery and air power. You needed air superiority and a batch of infantry to protect tanks even then. WWII tanks could even be immobilized (though not "cooked") by 0.50 cal into the engine compartment from above. A lot of T34 were lost that way.
There are a few factors working against tanks in Ukraine ... and yes, the drones do not help, especially as forward spotters for artillery.
However the biggest problem here is the Ukrainian war has degraded into trench warfare with extensive minefields, tank traps and and batteries of artillery.
For reasons unknown, the west was slow providing long range weapons early on allowing the Russians time to setup extensive defences and mine fields extending many 100s of miles, just back from the front lines, completely unhindered. The Ukrainians had to sit back and watch all winter as the Russians built defences becasue they had neither the long range artillery nor the air power to reach that far.
Predictably after our politicians, through nervousness about committing, gave the Russians a chance to build extensive defence lines, many of these same people are upset about the lack of Ukrainian success against the same defences they allowed to be built by restricting longer range weapons.
Tanks are creatures better suited to the fast moving mobile battlefield, they are absolutely not suited for deployment as pill boxes for infantry support, they need to keep on the move. Tanks are designed to be part of a combined arms assault accompanied by mechanised infantry and supported from the air, keeping on the move and advancing tens or even hundreds of miles in a day.
Now, the actual infantry support weapon Ukrainians probably need right now, would be something more akin to a modern version of the early war German close support Stug (late war Stugs were tank destroyers) - but no-one builds Armor like that anymore , as no one thought we would be back in trench warfare in the 21st century.
If at some point the Ukrainians smash through the Russian defensive lines, and the tanks can move again, the donated tanks will suddenly be useful, in the way they are meant to operate.