LW items shouldnt synergize with flat pen the way they do now

As the game calculates currently, % pen comes first, then flat reduciton.

This allows people who want to itemize to assassinate to still destroy tanks because they can just get an LW item on top of all their flat pen, shred the tank's bonus armor by 45%, and then apply all the flat pen after that massive shred.

This is something that shouldve been done a long time ago. If you wanna assassinate fine, if you wanna tank bust, fine, you can't get the best of both worlds.

TL;DR change the coding to calculate flat pen first, and % pen afterwards.

EDIT

The real underlying message of the OP is that if an ADC (particularly caster ADCs) wants to build lethality items to spike early and delete squishies with near true damage, they shouldn't be able to just top off their lethality build with an LW item so that they can continue to deal near true damage to squishies while also having SEVERE kill pressure on tanks because the LW shred applies first and then the flat pen (thus negating way too much of the tanks armor despite the ADCs building a ton of assassin items).

Most assassins don't usuall take LW items, they only take lethality and raw AD items, making them good against squishies but weaker against tanks. ADCs that utilize lethality make up a weird section of users of lethality because their kits allow them to utilize lethality well against squishies, while still outputting enough sustained damage to allow them to get LW on top of their lethality items and still lay the beatdown on tanks.

TL;DR FOR EDIT

If an ADC wants to build lethality and spike earlier, they can't be allowed to just build an LW item on top of it and get the best of both the tank busting and squishy deleting worlds.