^not implemented

Just about every module out there has a stacking penalty already. Just round it out and add stacking penalty to these as well.

The Prototype Shield Extender would follow the path below as you stack them:

• 66.0
• 57.4
• 37.8
• 18.7
• 7.0

The Prototype Armor Plate would follow the path below as you stack them:

• 135.0
• 117.3
• 77.3
• 38.2
• 14.3

For 4 extenders, you'd lose ~84 shield to stacking penalties. For 4 plates, you'd lose ~172 armor to stacking penalties. How does this help? For starters it helps shield stacking look more amenable because you lose less as you stack. The percentage penalty is the same, but your second extender only lost 9 EHP while your second plate lost 18 EHP. But beyond that it will make brick scouting much less palatable.

Heavies wouldn't really need to care in the first place. Sentinels are already up above 1500 EHP already, these penalties account for about a 10% reduction on someone completely brick tanked. Commandos have too few slots for the stacking penalty to add up. Mediums would have to consider themselves a little better, but they have plenty of fitting space to add more things anyway. Plus, Assault suit bonus could always be "less penalty to fitting shield / armor / damage / biotic mods".

Scouts simply wouldn't be able to brick tank as effectively anymore. Losing 84 shield and/or 172 armor is pretty huge on a suit that sits below 300 EHP naturally. On the maximum end:

• Cal scout would lose 102 EHP
• Gal scout would lose 181 EHP
• Min scout would lose 112 EHP
• Am scout would lose 181 EHP

People would still brick scouts, but they wouldn't go on cloaked terror sprees anymore. EWAR skills become the smarter build, as does spreading out your mods to get the most bang per ISK.

The only problem is with armor plating providing such massive HP at comparably little fittings costs.

Complex shield extender = 72.6hp (including skill buff) 36 CPU 16 PG
Complex armor plate = 148.5hp (including skill buff) 54 CPU 11 PG

So for 33% less CPU and 45% more PG you get over 200% more HP.

That's insane! And it is that crazy HP that allows gal and amarr scouts to reach the extreme tanking levels you are seeing. If armor plates gave less HP than they do now, base eHP would have much more of an impact on tanking abilities and medium frames would once again be in a better place.

However, this still doesn't address the fact that there is scarcely a better fittings tactic in this game other than brick tanking.

because currently Scouts can tank just as much if not more than Assaults.