I did. Still it is a lot of arguments that you enumerated that are misleading. The truth is that there are more upgrades avaliable for sections than for grens. The truth is that sections are simply stronger.
Half of these upgrades grens have without spending additional dime....
Sections can do the same but better. Remember that after the first few minutes of the game all factions can rely on support. Stop repeating the myth that it is only ostheer. There is no difference between factions in this respect. A good player always supports their infantry. The problem begins when players can't use support units they have and keep asking for buffing their mailine infantry instead. Anither problem begins when they lose to a player who can support and they think it is because of their infantry being inferior. It is simply wrong to not notice how much support IS can have.
Sections actually can't snipe team weapons just as good, can't make enemy HMG deathloop, can't get opponent out of cover without exposing themselves, can't keep light vehicles away from team weapons.
And yeah, there is a MASSIVE difference on reliance on support weapons between the factions.
Now, about the red part, agreed, you are 100% correct, that's why people who want to buff grens should finally shut up. Sections were overnerfed on the other hand and had to be rebuffed.
Lastly, sections have LESS and less efficient support then grens, vickers suppresses worse then HMG42, sniper shoots slower, there is no mobile mortar to help them at all, no reinforcement halftruck that also heals them, no assault infantry protecting them from CQC specialists.
Those support weapons are not less cost efficient! Many of UKF units are simply more cost efficient that those of ostheer's.