So I looked into the removal. It appears that it was removed for being considered low-effort or non-constructive. Reading through the context, the thread comes across to me as more of an expression of frustration and not providing any suggestions for how to improve the turrets.
If expressing frustration was your goal, then we have a dedicated sub-board for that in RANT. However, if you want to discuss what improvements can be made to towers, we do ask that you spend a bit more time on your content. We are actively looking for threads in Gameplay that are content forward so to speak, sparking productive discussion. Merely expressing frustration about something and telling Riot to fix it isn't enough.
For example, perhaps your thread could follow this type of structure:
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State the problem without ranting (turrets are too weak, especially at the nexus)
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Explain why you think this is a problem (it doesn't provide much defense for helping you avoid defeat)
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Elaborate on what you think is causing the problem (Turrets don't do enough damage, they take damage too easily, they have too little health, they don't have enough resistances, they don't ignore armour enough, etc....)
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Provide a solution to the problem (Give turrets more damage, change their priorities when targeting champions, make defenses stay longer through the game, etc...)
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Ask for feedback
Be sure to also have a descriptive title or somehow provides more information about the thread's content versus just the word "turret". For example, perhaps "Turrets are too weak to defend your nexus!"