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You keep saying IG formations are "bigger" which means they're less vulnerable to being broken, but that's quite a blanket statement, when many IG formations are actually quite small and easily broken (vultures, SHT platoons, sentinels) which on T3 is part of the game, you would be removing that option for an opponent, and making it the king of late game comebacks
You are right there are some formations that are similar or smaller sized like the sentinels, but most of the core formations are far larger. for instance, a mechanized coy is around 20 units, and a standard russ formation is 10 units and a regular infantry coy at 13 units. A marine Tactical detachment take 18 BM to break with vehicles and even the small devastators take 8 without transport. Compare that to Cataphractii: Valdor and Russ coys are 5 units
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...inventing special rules to bandage a vulnerable formation speaks of deeper problems with the list in my personal opinion, plus the bog standard formations can be buffed against easy breaking by adding extra tanks instead of new special rules.....
Well... this is EXACTLY what the core marine list did with ATSKNF. You take that special rule away and marines are fundamentally unplayable due to formation size. I think it's perfectly acceptable to create special rules to allow a list to function appropriately and differently so long as you don't create an abundance of SR for a single list.
Anyway, if everyone is this opposed to making it easier for them to rally and shed BM, then lets move a different direction with the rule. We still have the option of the blessing rule granting the formation walker and an invulnerable save as a means of showing the techpriest repairing normally catastrophic damage or getting vehicles stuck in dangerous terrain free.