The main reason for the absence of medical evacuation is simple and gruesome: The fighting is just too intense.
It can take a day or even two for soldiers to get in and out of the fiercest fighting spots – killing any hopes of medics coming to save the wounded.
Left alone at the positions, the soldiers often have to pull out their comrades on their own under heavy shelling, sometimes walking five to seven kilometers to the nearest evacuation points, where vehicles take them to makeshift hospitals.
When soldiers carry their wounded out, the group is easy to spot – and it immediately becomes easy prey to Russian first-person view (FPV) drones and artillery.
Basically every world power is a reactionary right-wing oligarchy with either a bourgeoisie “democracy” or straight up dictatorship. So yeah you and we see it all the time.