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I understand why high rpm is bad on a cold engine, but what is wrong with high load and low rpm? I mean mecanicly, is there any damage? And where? Most people recomend driving "gently". Why?

i got this ideea; i can't know how much city/hiway/high/low speed/racing i am doing every time; so, as i understand, aged oil main problem is that it gets diluted and thiner; it means oil presure should get lower, right? example: fresh oil, 200F @idle = 24psi; when it gets to 20psi - i change...