It is a RTS game, that's the way it is. I stated that the mortar even is an exception because every unit needs some kind of babysitting. The mortar was IMO never meant to fire at every single soldier it sees. Just see it from a Rock Paper Scissor point of view:
Mortar: Rock
Support weapons: Scissors
Infantry: Paper
The mortar (Rock) is meant to counter Supports (Scissors) and should die from Inf (Paper). But currently the Rock simply hammers against Scissors AND Paper and can mostly only be countered by other Rocks, which should not be the case. You have to face MGs and PaKs and you have to maneuver your inf through the battlefield. How hard would it be to tell your mortar to "barrage this MG here"?
As I said, it's the same with all support weapons currently EXCEPT indirect fire units. By your logic, a PaK should place its cone to where a tank will appear if it is visible on the minimap. Same for MGs. But that's not the case. A mortar automatically barrages the last position, an enemy soldier was seen. Why doesn't the PaK automatically face the last tank that has been seen too?
If somebody forgets his Katy or Stuka then it is his own fault. Don't invest in a unit you don't use.
Sorry but all your points state are just some kind of "lazy logic". While removing auto barrages would add bit more micro to the game, it would also make the game way less hectic. In my opinion all the RNG wipes and losses from auto barrages require much more micro because your units are being under fire and dying all the time without any further micro investment from your enemy.
THe best thing about CoH is that it's not that simple stupid Rock paper scissors pudding that EVERY OTHER RTS HAS.
play a different one if you don't like it. Htere are enough of it