Turrets should do true damage after X hits

Agreed. They could also ramp up both harder and faster. RiotRepertoir said they're looking at increasing minion defenses soon, which might also mean that they'd want to simultaneously buff turret damage so that the formula for CSing under a turret stays the same number of turret shots + champion autoattacks. Tanking turrets should be a tank role, shared to an extent with fighter classes like Juggernauts and Vanguards. I think they should be heavily rewarded by building resistances and health as a reinforcement to perform their role as turret body-blockers, so I naturally disagree with arguments to make turrets do true or %hp damage. In my opinion, the problem is the ease at which non-tanky champions, like assassins and certain fighters who do not build resistances, can towerdive and the ease at which ranged champions can poke you under turrets without putting themselves at much risk even if they make a mistake and take turret aggro.

Here is an example turret damage formula that I would like: Turret base damage = 300 + 20 per minute after 4 minutes up to minute 25 for a maximum of 720 base damage after 25 minutes in. Damage is split 50/50 between Physical and Magic. Because of base resistances, everyone including squishes, would take less than the base damage in practice. Minions would take reduced turret damage as needed to balance and preserve the current under-turret-farming pattern.

Damage ramp-up is previous_iteration*0.9 + base_damage/4 This creates a ramp-up chart like this at 4 minutes in: 300 345 385.5 421.95 454.76 484.29 510.87 534.79 556.32 575.69 593.13 608.82 622.94 635.65 647.09 657.39 666.66 675 682.5

... Capping at 750 after some number of iterations depending on number rounding.

And like this after 25 minutes in: 720 828 925.2 1012.68 1091.42 1162.28 1226.06 1283.46 1335.12 1381.61 1423.45 1461.11 1495 1525.5 1552.95 1577.66 1599.9 1619.91 1637.92 ... Capping at 1800 after some number of iterations depending on number rounding.

If my math is correct: As a squishy with 900 health and 30 of each resistance, you can survive 3 turret shots at 4 minutes. As a bruiser with 2k health and 100 of each resistance, you can survive 5 turret shots after 15 minutes. As a squishy with 2k health and 50 of each resistance, you can survive 3 turret shots after 25 minutes. As a bruiser with 3k health and 150 of each resistance, you can survive 7 turret shots after 25 minutes. As a full-tank with 5k health and 200 of each resistance, you can survive 12 turret shots after 25 minutes. As a 20k health with 200 of each resistance, you can survive 39 turret shots after 25 minutes (except active only lasts 4 seconds so it's just for laughs and not a real example).

I think:

1. Yes, it should ramp-up to a higher cap (or infinitely) but the ramp-up rate should have diminishing returns so that it starts ramping up quickly then fades to a slow ramp-up.

2. No, turrets shouldn't deal true damage or %hp damage. Tanks should be many times more resistant to turrets than squishy champions are.

True damage is made to hurt tanks. Would you rather unkillable 5k health beasts?