Ukraine

That's just not how they're using drones. They have specialised drone units, as well as drone operators that are attached to ordinary infantry units. If every guy in your unit is operating a drone, you're ridiculously vulnerable to people advancing on your position, if only because a drone, while being accurate, has a stupidly low "rate of fire". See my other comment on suppressing an enemy.

If a couple dozen soldiers with or without armoured vehicles are advancing on your position, you need a certain rate of fire to keep them pinned down to prevent them from advancing. One drone hitting that group every 30 seconds does far less of a job in that regard than a single MG sending out bursts every two seconds. Of course, once you've pinned down the advancing enemy, drones are great, but you can't get away from small arms being essential in combat situations where distances are < 400 m, which is a lot of them.