Should we also implement this for HMG, ATgun etc... all units in fact. If you don't give them direct order they stay here and do not fight.
There are many ways to reduce their effectiveness, but removing auto-fire is just bad and already tested with the ISG/Pak and considerate as bad idea at the end.
Comparing Mortars with other units such as an MG and Pak you actually have to micro much more as you cant shoot units outside of its arc of fire and their position is often more important such as putting MGs behind Green Cover or making sure there isnt many shock blockers the enemy can dip around, overall theyre more risk vs reward compared to mortars
The test for the ISG/Pack Howie was because they had suppression
Everytime you see a Mortar its behind a building or a screen of enemy forces so often unreachable unless flanking (which can be dangerous) or building your own indirect and when you do get a flank off it often isnt that successful as they just need to retreat or brace there is no reason for them to stay and fight and unless Im winning theyre just gonna comeback, now some factions do have good stock counters like the Stuka Halftrack for OKW but otherwise it will either be overrun them with your units or build your own indirect to have an arty fest
But the problem I have is that they should only be effectiveness vs static forces but still if you be mobile the mortars will slowly tear you down
Now if you take cover behind something and the enemy has a mortar nearby he doesnt have to do anything literally nothing for that Mortar to attack you it will do it by it self then if I move a squad to a different position guess what Im still being bombarded until I leave its range or kill it, Im putting in all that micro to avoid a mortar while the owner of the mortar isnt even controlling the mortar
While say a Pak or MG you can fight somewhere else so it cant reach you and if it actually wants be apart of a battle it will have to move and if I am forced to fight, I can smoke or try to stay outside of its arc all the while forcing the enemy to reposition his team weapons
Unless you're a Brit Team Game player who's only strategy is emplacements then you shouldnt have much of a problem with the Mirco tax this puts on you